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 Odious creep (10)
  2. 7a Uncommunicative (8)
  3. 8a Far from extreme (4)
  4. 9a Long-tailed bird of prey of the hawk family (4)
  5. 10a Throb (7)
  6. 12a Settle misunderstandings (5,3,3)
  7. 14a Nick a vehicle (7)
  8. 16a Strike violently (4)
  9. 19a Piece of foliage (4)
  10. 20a Oil from a citrus fruit used to flavour Earl Grey tea — to grab me (anag) (8)
  11. 21a Put your feet up (4,2,4)
  12. 1d Follow stealthily (5)
  13. 2d Specially long and formal letter (7)
  14. 3d Top deity on Olympus (4)
  15. 4d Heated but petty argument (8)
  16. 5d Arboreal primate native to Madagascar (5)
  17. 6d Layer of roof slabs (6)
  18. 11d Melting pot (8)
  19. 12d Purplish-red (6)
  20. 13d 22nd US state, joined 1819 (7)
  21. 15d Kind of orange (5)
  22. 17d Silly — ridiculous (5)
  23. 18d Legal document (4)