No 12482, Tuesday 27 Nov 2018, Anon

ACROSS
1   Fight, cautiously at first, with headless marsupial (6) COMBAT {Ca...y}{wOMBAT}
4   Sign up for core agency with form (6) ENLIST {agENcy}{LIST}
9   Essential oil erases trace of lint from church (4) ATAR AlTAR I thought it was ATTAR?
10 Notice of official’s run (10) ADMINISTER {AD}{MINISTER}
11 Mexico’s national flower for Wooster’s aunt (6) DAHLIA [DD]

12 Most untidy doctor sees diet (8) SEEDIEST*
13 Rebel met apsara with artificial sweetener (9) ASPARTAME*
15 Endlessly regretting system’s initial damages (5) RUINS {RUINg}{Sy...m}
16 Stableboy goes first, returns from heath (5) GROOM {Goes}{MOOR<=}
18 Duped by game of journalist (9) SNOOKERED {SNOOKER}{ED}
22 On duty, apes, tipsy, did not go to bed (6,2) STAYED UP*
23 Certificate to indicate alien (6) TICKET {TICK}{ET}
25 Oddly, I’m muscular in effigy (10) SIMULACRUM*
26 Snakes pass all over the place (4) ASPS*
27 Regularly warn those people of song (6) ANTHEM {wArN}{THEM}
28 Pineapple fruits without origin (6) ANANAS bANANAS

DOWN
1   Hack girl with weapon (7) CUTLASS {CUT}{LASS}
2   Remove initial stain from bit of mushroom (5) MOREL MORsEL

3   First man, insect stubborn (7) ADAMANT {ADAM}{ANT}
5   Behead tenants violently at French city (6) NANTES tENANTS*
6   Set up conservatory (9) INSTITUTE [DD]
7   The primary cause of betrayal (7) TREASON {The}{REASON}
8   Cook makes menu part of funfair (9,4) AMUSEMENT PARK*
14 Newspaper columnist, young, at an organisation (5,4) AGONY AUNT*
17 Wine head sommelier wrapped in tissue layer (7) RETSINA {RET{So...r}INA}
19 Footstool for Turk (7) OTTOMAN [DD]
20 Dismisses former eccentric temps (7) EXEMPTS {EX}{TEMPS}*
21 Envisage single male finally in engagement (6) IDEATE {1}{D{malE}ATE}
24 Secure tea at home (5) CHAIN {CHA}{IN}

GRID