Complete
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6 7 10 13 17 21 23 1 14 2 12 11 3 16 22 15 4 8 20 18 5 19 9
  1. 1a Lowest possible level (4,6)
  2. 7a Harry Potter author (7)
  3. 8a Trimmed — peeled (5)
  4. 10a River over which Charon carried dead souls (4)
  5. 11a Exceptional (8)
  6. 13a Best ever performance (6)
  7. 15a Pleasant smells (6)
  8. 17a Snow storm (8)
  9. 18a Trounce (4)
  10. 21a Exhaust (5)
  11. 22a Large Arctic deer (7)
  12. 23a Officials who once made public announcements (4,6)
  13. 1d Loud and rough (5)
  14. 2d Gambling token (4)
  15. 3d Away with you! (6)
  16. 4d First-rate (3-5)
  17. 5d Rower (7)
  18. 6d Forbidden (10)
  19. 9d Salted and strongly flavoured cheese (6,4)
  20. 12d Person from Phoenix? (8)
  21. 14d The Windy City (7)
  22. 16d Investigator looking for missing person(s) (6)
  23. 19d Flowing outer garments (5)
  24. 20d Faithful (4)