1 Cliques of supporters holding court and gathering input and output (8) FACTIONS - Cliques (def) from FANS (supporters) holding CT (court) gathering IO (input and output) 5 Toper swallowing crude metal regulator (6) SPIGOT - regulator (def) from SOT (Toper) swallowing PIG (crude metal as in pig iron) 9 Artist picked up by vehicle on route to plant (8) CARRAWAY - plant (def) from RA (Artist) picked up by CAR (vehicle) on WAY (route) 10 Enhance retrograde puzzle with last pieces missing after German approval (4-2) JAZZ-UP - Enhance(def) from ZZUP (puzz(le) with last pieces missing) reversed (retrograde) after JA (German approval) 12 Plant fourth and fifth letters on international rugby player (9) DANDELION - Plant (def) from D AND E (fourth and fifth letters) on LION (international rugby player) 13 Scottish settlement fully on alert at the outset (5) ALLOA - Scottish settlement (def) from ALL (fully) OA (On Alert at the outset) 14 Jam about record (4) CLOG - Jam(def) from C (about) LOG (record) 16 AA motel served up foodstuff (7) OATMEAL - foodstuff (def) from anagram (served up) of AA MOTEL 19 Locks shortened for mullet, say(7) HAIRCUT - Locks shortened (def) from mullet, say (def) 21 Purchases free passes reportedly (4) BUYS - Purchases (def) from honophone (reportedly) of BYES (free passes) 24 Grain exposed by raising edge on a uniform (5) PILAU - Grain (def) from PIL (LIP reversed=raising edge) on A (a) U(uniform) 25 Reporting to one pledging missing article (9) ANSWERING - Reporting to (def) from AN (one) SWE(a)RING (pledging missing article) 27 Old bird is non-resident (6) EXTERN - non-resident (def) from EX (Old) TERN (bird) 28 Soft ground drug many adapted for one who scares children (8) BOGEYMAN - one who scares children (def) from BOG (Soft ground) E (drug) and anagram (adapted) of MANY 29 Mounted horse in best rodeo (6) STRODE - Mounted horse (def) contained (in) beST RODEeo 30 Where to find patient play regularly toward the centre (8) INWARDLY - toward the centre (def) from INWARD (Where to find patient) LY (pLaY regularly) 1 Front to diminish around Canada (6) FACADE - Front (def) from FADE (to diminish) around CA (Canada) 2 My! One short article's sunny feature (6) CORONA - sunny feature (def) from COR (My!) ON (One short) A (article) 3 Angry one to judge (5) IRATE - Angry (def) from I (one) RATE (to judge) 4 Close to sending information back about rainstorm (7) NEARING - Close to (def) from NEG (sending information back) around (about) anagram (storm) of RAIN 6 Land labourers pry about as Etna erupts (9) PEASANTRY - Land labourers (def) from PRY about anagram(erupts) of AS ETNA 7 Animals look fixedly at small measure rising (8) GAZELLES - Animals (def) from GAZE (look fixedly at) LLE S (ell (measure) S (small) rising) 8 Highest sheets on board as pilots ascending (8) TOPSAILS - Highest sheets on board (def) from anagram (ascending) of AS PILOTS 11 Unravel naked setter, perhaps (4) UNDO - Unravel (def) from (G)UNDO(G) (setter, perhaps) with outer laetters removed (naked) 15 Incomplete enquiry into upcoming transfer glossed over(9) LACQUERED - glossed over (def) from QUER(y) (Incomplete enquiry) into LACED (upcoming decal=transfer) 17 Dogs beat favourites (8) WHIPPETS - Dogs (def) from WHIP (beat) PETS (favourites) 18 Lawbreaker's instrument on hill (8) VIOLATOR - Lawbreaker (def) from VIOLA (instrument) on TOR (hill) 20 Note one thousand in wood (4) TEAK - wood (def) from TE (Note) A (one) K (thousand) 21 Male voice with nothing on music producer (7) BASSOON - music producer (def) from BASS (Male voice) O (nothing) ON 22 Shot scum at remedial centre (6) FILMED - Shot (def) from FILM (scum) at remEDial centre 23 Type of business bringing an officer to outskirts of city (6) AGENCY - Type of business (def) from A GEN (an officer) to CY (outskirts of city) 26 Swelling problem in America held back by famed endocrinologist (5) EDEMA - Swelling problem in America (def) spelled (OEDEMA in Europe) from held back by fAMED Endocrinologist