I usually avoid DA puzzles because they're scary! A few clues that I haven't quite parsed, and one lookup. There were a couple of two-layered clues, which I thought was an interesting (if rather fiendish) mechanism.

Across

7

Chocolate truffle centre gets stray cheer - twice - or frolic (7,6)
FERRERO ROCHER — F (centre of truffle), ERR (stray) then an anagram (frolic) of CHEER, OR, OR

10

Twisted defrocked vicar where he belongs? (7)
HELICAL — ICA (defrocked vicar) inside HELL (where he belongs, cryptic cluing)

11

KGB hub all excited, nabbing enemy agents cold (7)
GLACIAL — G (KGB hub, i.e. central letter), anagram of ALL with CIA (enemy agents) inside (nabbing)

12

Tyro, 10, escapes in between cracks (6)
NEWBIE — anagram of InBetWEEN (without letters from ten)

13

Dismiss hammy place for drills (4,4)
BOOT CAMP — BOOT (dismiss) CAMP (hammy)

15

Siren (loud) released in earlier halves (7)
LORELEI — first halves of LOud RELEased In

16

Gig worker needs years to make paint (7)
TEMPERA — TEMP (gig worker) years (ERA)

18

Picked up cycle to visit uni dives - reviewed one recommended for a bite (8)
BICUSPID — BIC (picked up cycle, BIKE), U (uni), reversal (revied) of DIPS (dives)

20

Maintain fantasy to bear bub (6)
INFANT — hidden (to bear) inside maintaIN FANTasy

22

Return aboard Central train for mourners? (7)
CORTEGE — TEG (GET back, return, cryptic cluing) inside (aboard) CORE (central)

23

Praise eggs, see, taken from cream (7)
OVATION — OVA (eggs) loTION (cream) without lo (see)

24

It scans bombing order ace pilot acquired (7,6)
BARCODE READER — anagram of ORDER ACE inside BADER (pilot)

Down

1

Oz route (Bowral - Rocky) led one out (6,5,4)
YELLOW BRICK ROAD — anagram of BOWRAL ROCKY LED I (one)

2

Dog jumped up to bite chair, faulty on the arm (8)
BRACHIAL — reversal (jumped up) of LAB (dog) with an anagram of CHAIR inside

4

Nightbird's head covers wings to groom around heart (9)
FROGMOUTH — FROTH (head) around GM (wings to groom) OU (heart of around)

5

Force trains to drop off regulars, some 12.5 percent? (6)
OCTANT — even letters of fOrCe TrAiNs To

6

PM staffer and I upset detectives' modern assistant, a FIFO worker perhaps (7,8)
MEDICAL EXAMINER — ME (I) reversal (upset) of CID (detectives), ALEXA (modern assistant), MINER (a FIFO worker perhaps)

8

Local crawler to damage hut reckons Spooner (11)
SHINGLEBACK — Spoonerism of BINGLE SHACK

9

Massive soccer star rolled to gain solo point? (11)
ELEPHANTINE — reversal (rolled) of PELE (soccer star), HAN (Solo), TINE (point)

14

Six parts completed? Send out investor's bonus (9)
DIVIDENDS — VI (six) inside (parts) DID (completed), then an anagram of SEND

17

Myanmar city stall audited by fellow (8)
MANDALAY — MAN (fellow), homophone (audited) of DELAY (stall)

19

Smell gun chamber sap scrubbed (6)
STENCH — STEN (gun) CHamber without amber (sap)

21 & 3 down

I sign off? (5,5)
YOURS TRULY — double def.