Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 10 16 14 8 21 5 6 15 7 19
  1. 1a Not talkative (8)
  2. 5a Moment (informal) (4)
  3. 9a Powder from ground pods used as a chocolate substitute (5)
  4. 10a Calumny (7)
  5. 11a Spa treatment? (12)
  6. 13a Adjust an instrument or vehicle (4,2)
  7. 14a No matter who (6)
  8. 17a Roundish male (anag) — not eating properly (12)
  9. 20a In the vanguard (7)
  10. 21a Subject to (5)
  11. 22a Killed — a large number (4)
  12. 23a Closest possible finish (4,4)
  13. 1d Blood-sucking member of the spider family (4)
  14. 2d Palaver (5-2)
  15. 3d Illness that killed John Keats and George Orwell (12)
  16. 4d Puts instruments and dials back to zero (6)
  17. 6d A Passage to ___ , 1924 EM Forster novel (5)
  18. 7d Boat operators (8)
  19. 8d Unharmed (4,3,5)
  20. 12d Spur to action (8)
  21. 15d Past the stipulated time (7)
  22. 16d Outdoor shoe with a perforated pattern in the leather (6)
  23. 18d Permission (5)
  24. 19d Badly-behaved youngster (4)