Complete
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1 8 10 12 19 21 2 18 3 13 15 4 9 16 5 14 6 17 20 7 11
  1. 1a Crude but effective (5,3,5)
  2. 8a Brutal — high moorland (4)
  3. 9a Sign of approval (6,2)
  4. 10a Uruguayan port city, once known for exporting corned beef — by seafront (anag) (4,6)
  5. 12a Dracula's creator — furnace feeder (6)
  6. 14a Purchasers (6)
  7. 15a Unwieldy (10)
  8. 19a Famous (8)
  9. 20a See 7
  10. 21a English county (13)
  11. 2d Make too high an estimate of (8)
  12. 3d Fielding position — narrow channel (5)
  13. 4d Aardvark (7)
  14. 5d Discourage (5)
  15. 6d Ambassador's residence (7)
  16. 7d Introductory beats (4,4)
  17. 11d Tooth — real romp (anag) (8)
  18. 13d Commencement (4-3)
  19. 14d Mixed together (7)
  20. 16d Tropical fruit (5)
  21. 17d Dark-skinned red wine grape (5)
  22. 18d Optimal (4)