Clever stuff
Across
9 SCROUNGER sponge SC scilicet – namely [l]OUNGER couch minus L left
10 UNTIL before UNLIT dark L and T swapped
11 AMIABLE friendly AM assembly member Wales (ELBA I)< islands recalled
12 PUDDING fool (eg gooseberry) PUD hand DING[o] tailless dog
13 TAB dd
14 JUGULAR VEIN in neck – conducting blood from head (capital)
17 BUXOM jolly BUX[ton] OM honour
18 ERA period ER queen before A
19 FIBRE roughage FIB pork pie RE about
21 MAISONNETTE small dwelling IS ON NET in MATE partner
23 RUB polish RUB[y]
25 TAPIOCA dessert International Olympic Committee in TAPA snack
27 ROTUNDA building T[his] in ROUND approx A area
28 ENROL record hidden in [unbrok]EN ROL[e]
29 ESPIONAGE dd (witty)
Down
1 ASLANT oblique [cabi]N in A SLAT strip of wood
2 BRAINBOX clever figure BRA 2 cups IN BOX at theatre
3 MUMBO-JUMBO gobbledegook MUM silent OB< JUMBO colossal
4 OGRE beast hidden in [bl]OG RE[pelling]
5 PROPELLANT rocket fuel PROP support ALL< everybody lifted in ENT
6 QUID chewing tobacco (greens – pounds money)|
7 STRIFE conflict STRIPE band P swapped for F fellow
8 ELEGANCE refinement LEG part of garment in SÉANCE minus S son
15 GREEN PAPER discussion paper GREEN PAUPER minus U refined
16 REFECTION thought R[ouse] F[ighter] in ELECTION political contest
17 BUM STEER false info (MES[s] BRUTE)*
20 BARONIAL &lit (LAIR A NOB)*
22 IMPORT drift IMP young offender [s]ORT type
24 BLAZER jacket B bachelor LASER light – sounds like
26 ORLY airport O old R[a]L[l]Y
27 RIPE mature GRIPE beef minus G[ristle]
( )* = anagram < = reverse [ ] = omit dd = double definition
Thanks Jed and Sleuth
NE corner defeated me but an enjoyable challenge