No 12452, Monday 22 Oct 2018, Buzzer

ACROSS
1   Moving to wide slip keeps runs down (3-8) LOW-SPIRITED {TO+WIDE+SLIP}* over {R}
9   Private leaving navy, a changed person (6) COVERT COnVERT
10 Embarrassed mixing up he's, his penning epistle (8) SHEEPISH {HES+HIS}* over {EP}
11 Small and delicate fish losing front flipper (5) ELFIN {eEL}{FIN}
12 English singer entertaining queen with skill (5,2) EQUAL TO {E}{QU}{ALTO}
13 Battle of Atlanta's listing (2,1,5) AT A SLANT*
15 Look over fashionable hide (4,2) KEEP IN {PEEK<=} {IN}
16 Bolt is second in sprint after 10 metres (6) DECAMP {DECA}{M}{sPr..t}
18 Critical remarks in places of political unrest leaders of hostile parties exchanged (3,5) POT SHOTS {-h+p){POT} {S(-p+h)HOTS}
20 Storm encountered on the way back. It's a nuisance (7) TEMPEST {MET<=}{PEST}
21 Film unit disrupting shift (5) MOVIE {MOV{1}E}
22 Take liberties playing some piano out in the middle (6,2) IMPOSE ON {SOME+PIaNO}*
23 Skirt the edges of gemutlich site of Taj Mahal (6) GHAGRA {Ge...cH}{AGRA}
24 Guide everybody through present disaster (4,7) LEAD BALLOON {LEAD} {B{ALL}OON}

DOWN
2   Difficult task catching foe masquerading as insider (3,2,2) ONE OF US {ON{FOE*}US}
3   It kicks off first round before long delay (3,2) S?T ?N (Addendum - SIT ON {S(-o+it)IT ON} - See comments)

4   Examine where cult members are taking in pastor (7) INSPECT {IN}{S{P}ECT}

5   In kitchen, brunch (kiev) to be had often by cooler (3,6) ICE BUCKET {kItChEn+BrUnCh+KiEv+To}
6   Turn out with old bean (7) EXPULSE {EX}{PULSE}
7   Preparing to memorise absorbing article for later (4,5,4) SOME OTHER TIME {TO+MEMORISE}* over {THE}
8   Splash o' tint hear Manet described as positive influence (1,4,2,3,3) A SHOT IN THE ARM [T]
14 Pick up twig (9) APPREHEND [DD]
17 Excellent registered doctor within radius perhaps (3,4) ARM BONE {R}{MB} in {A ONE}
18 One of Potter's auntie in a way, Lily's relative? (7) PETUNIA {Po...r}{AUNTIE*}
19 Try hard, be well and happy with past (4,1,2) HAVE A GO {H}{AVE}{AGO}
21 Majority of cast entertaining grand and powerful producer (5) MOGUL {MO{G}ULd}

GRID