Cryptic crossword No 2,680

Across

1. High interest in usual tomfoolery — business up front, party in the back (5)
2. Returned to subs’ seats, um — he's hardly in the spotlight (11)
3. Frosty re split around rejected treatise (6)
4. Cob’s boy, say — youth gone from glory, then in fiasco (6)
5. Precise English up front - no exceptions! (5)
6. Heard you tussled returning for food (4)
7. Note hot spot for fish (4)
8. Featured in clue: German left with takeaway (3,5)
9. Whiskey-tinged singers change lines (8)
10. Smart: Yield meekly, willingly! (2,6)
11. Benefit from swapping back offices of worldwide startups (6)
12. Bookworm fails a grade reading "Praiseworthy" for Nobel laureate (6)
13. Heard Christmas time setter's friend's the best (8)
14. Apple pairing, that is, after odd rounds in bar (4)
15. “Darn!”: floats cast off foredeck’s head (4)

Down

1. Nearly all wet, but not me (4)
2. Prepared for, primed to be under pressure today (2,2)
3. Motif missing here (5)
4. Completely adore Canadian jazz singer—and her openers off setlist (7)
5. Remarkable, fashionable topless supporter of country (4)
6. Eventually, pure customer is the final arbiter (7,5)
7. Rush-hour drivers’ Minis rebadged to Peugeots, becoming workhorses (9)
8. Film dive as a kick misses French one acrobatically (9)
9. Malaysia's ambassador’s craft, said to endure after shipwreck (2,5)
10. Gatekeepers' lot: tide turned as SRO patrons exited stage left (7)
11. Weenies in a trayful, tails off, he made my way (5,7)
12. Resentful society: bottom 50% out of work (4)
13. Civility—Carnaby Street vibe, opposition ditched (7)