* = Anagram

ACROSS
1 At university turn against airflow (6) 
UPWIND  - against airflow (def) from UP (at university) and WIND (turn)

5 Last couple to analyse some cubist painter's period (8) 
SEMESTER - period (def) from last two letters (last couple to) in analySE soME cubiST paintER

9 One who rates fool coming up roses (8) 
ASSESSOR - One who rates (def) from ASS (fool) and ESSOR  (*ROSES) coming up

10 Plundered bag king held oddly (6) 
SACKED Plundered(def) from  SAC (bag) with K (king) and ED (hElD oddly)

11 Yarn from second old musical (6) 
MOHAIR - Yarn (def) from MO (second) and HAIR (old musical - Hair launched on Broadway in 1968)
 
12 Lean Frenchman returning old magazine missing article (8) 
LISTENER - old magazine missing article (def) (The) LISTENER frok LIST (lean) and ENER ( Frenchman RENE returning = reversed)

14 Suffering one's friend conceals without emotion (12) 
IMPASSIONATE - without emotion (def) from PASSION (suffering) in I MATE (one's friend conceals)
 
18 Quick glance at boy coming back with page for gossipy rag (7,5) 
SCANDAL SHEET - gossipy rag (def) from SCAN (quick glance) with (at) LAD (boy coming back) with SHEET (page)

22 Comparatively odd holy man called her majesty (8) 
STRANGER - Comparatively odd (def) from ST (holy man) RANG (called) ER (Elizabeth Regina - her majesty)

25 Viewer rented out little hole (6) 
EYELET - little hole (def) from EYE (viewer) and LET (rented out)

26 Note officer when occupant leaves environment (6) 
MILIEU - environment (def) from MI (note) and LIEU (Lieutenant without tenant - officer when occupant leaves)
 
27 Wood longs, it's said, for sweet snacks (3,4) 
TEA-CAKES - sweet snacks (def) from homophone (it's said - of Teak and Aches)

28 Emulating troublesome lady: swish her around (8) 
SHREWISH - Emulating troublesome lady (def - like a shrew) from *SWISH HER (around)

29 Finely adjusts weight through breaking sweat (6) 
TWEAKS - Finely adjusts (def) from K (weight - K = Kilo) in (through)  *SWEAT (breaking)


DOWN
2 Clergyman throwing a strop (6) 
PASTOR - Clergyman (def) from *A STROP (throwing)

3 Repetition of number one vetch to note on the way up (9) 
ITERATION - Repetition (def) from NOI (number one) TAR (sailor) E (European) to TI (note) all reversed (on the way up)

4 Sandy area on seed plant (6,3) 
DESERT PEA - plant (def) from DESERT (sandy area) on PEA (seed)

5 On the radio priest's outfit is not required (7) 
SURPLUS - is not required (def) from homphone (on the radio) of SURPLICE (priest's outfit)

6 Jewish flight commander? (5) 
MOSES - cryptic def. Moses led the Jews in their flight from Egypt

7 Map makers leaving sugar in old South American capital (5) 
SUCRE - old South American capital (def - the Sucre is the former currency of Ecuador) from OS (map makers - Ordinance Survey) taken out of SUCR(OS)E (sugar)
 
8 Steel men rearranged basic parts (8) 
ELEMENTS - basic parts (def) from *STEEL MEN (rearranged)

13 Pair from lost world (3) 
TWO - pair (def) contained in (from) losT WOrld

15 Lacking refinement in transplanting heart of pachyderm with head of giraffe (9) 
INELEGANT - Lacking refinement (def) IN ELEGANT (transplanting heart of pachyderm i.e. ph in elePHant) with G (head of giraffe)

16 10 roamed about Quasimodo's workplace (5,4) 
NOTRE DAME - Quasimodo's workplace (def: Quasimodo was employed as bell-ringer in Victor Hugo's novel The Hunchback of Notre Dame) from *TEN (10) *ROAMED (about)
 
17 Like famous explorer from the north? (8) 
SCOTTISH - from the north (def) Like famous explorer (cryptic def: Something that is like Scott (of the Antarctic) could be said to be Scottish)

19 Put on flower (3) 
DON - Put on (def) and flower (def - the river Don)

20 Time to throw up on thoroughfare (7) 
STRETCH - Time (def) from RETCH (to throw up) on ST (thoroughfare)

21 Decorate journalist in stream (6) 
BEDECK - Decorate (def) from ED (journalist) in BECK (stream)

23 A fib about victory is topical (5) 
ALIVE - topical (def) from A with LIE (fib) about V (victory)
 
24 Architect from Italy replacing flashy finale (5) 
GAUDI - Architect (def) from I (Italy) replacing Y in GAUDY (flashy finale)