Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1a Plump (6)
  2. 4a Flash jewellery (5)
  3. 7a Students grouped according to ability (6)
  4. 8a Sister's headgear (6)
  5. 9a O Brother, Where Art ___ ? (2000 film with George Clooney) (4)
  6. 10a Has an inkling (8)
  7. 12a Noisy and disruptive ghost (11)
  8. 17a Person fluent in many languages (8)
  9. 19a Get rid of — tip (4)
  10. 20a Requiring action quickly (6)
  11. 21a Immoral — obscene (6)
  12. 22a Duck much valued for the female's down feathers (5)
  13. 23a Fatal (6)
  14. 1d Tackle a backlog (5,2)
  15. 2d Ill-matched (7)
  16. 3d Shattering revelation (9)
  17. 4d Colonel ___ , David Low's pompous army officer cartoon character (5)
  18. 5d Effects (7)
  19. 6d Like a fry-up? (6)
  20. 11d View from a theatre seat, say (9)
  21. 13d Bound (to do something) (7)
  22. 14d Comprehensive — detailed (2-5)
  23. 15d Cart for taking prisoners to the guillotine (7)
  24. 16d Dapper (6)
  25. 18d Someone on the way out ? (5)