Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Duke of 21's horse at Waterloo — capital city (10)
  2. 7a Parts of speech — poor nuns (anag) (8)
  3. 8a Greek aniseed liqueur (4)
  4. 9a Arrangement for deferred payment (4)
  5. 10a Unpaid debts (7)
  6. 12a Capital city — uneasier sob (anag) (6,5)
  7. 14a Interminable (7)
  8. 16a Habitual drunk (4)
  9. 19a Bonce (4)
  10. 20a Extremely agitated — if recent (anag) (8)
  11. 21a Kind of boot (10)
  12. 1d French landscape painter, d. 1875 (5)
  13. 2d Flamboyant style (7)
  14. 3d Common sense (4)
  15. 4d Hitler's nationality pre-1925 (8)
  16. 5d Bring to mind (5)
  17. 6d Portuguese North Atlantic islands (6)
  18. 11d Swollen-headed (8)
  19. 12d Decrepit old car (6)
  20. 13d Minaret (anag) — clothing (7)
  21. 15d Provide accommodation for (5)
  22. 17d Pungent vegetable (5)
  23. 18d Penny-pinching (4)