ACROSS
1. ←NAVY + REVILED← = DELIVERY VAN <goods vehicle>
8. N LIMBER* = NIMBLER <less clumsy>
9. CI + ←RAG← = CIGAR <Cuban export>
10. <over-the-top> EXTRA = (...l)EX TRA(c...)
11. U BROS inside S_A = SUB ROSA <secretly>
12. <cheerful> JAUNTY = JAUNT + Y
14. <list of characters> STRING = ST RING
17. CHA + PAT + I = CHAPATI <bread>
19. BRAW_ + L = BRAWL <rough fight>
21. <inform> EDIFY = ←FIDE← Y
22. ASSIST after B = BASSIST <jazz musician>
23. (...r)M IS IN FORM ED(u...) = MISINFORMED <having been badly taught>

DOWN
1. JACK inside (IN RENTED)* = DINNER JACKET <tux>
2. <keep lid on> LIMIT = MI inside LIT
3. <heroic> VALIANT = ←NAIL← inside VAT
4. <least-often seen> RAREST = RA + REST
5. <words> VOCAB = VO CA B
6. R_ inside (ONE GIN)* = NEGRONI <cocktail>
7. <made a survey of> TRIANGULATED = ADULTERATING*
13. RANI inside UU + M = URANIUM <source of power>
15. AB inside ⭯ASCOT⭯ = TABASCO <one very hot>
16. GB _E_ inside BIN = BIG BEN <landmark>
18. AB + Y + SS = ABYSS <Hell>
20. <it's assumed> AXIOM = ←MA← outside XI O