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 Early version of a popular card came — a big reduction (anag) (7,6)
  2. 8a Of champagne, extremely dry (4)
  3. 9a Turkey filler (8)
  4. 10a Lightweight latex with an air-filled structure (4,6)
  5. 12a Intrude in other people's affairs (6)
  6. 14a Draw absent-mindedly (6)
  7. 15a Fond of company (10)
  8. 19a Highly advanced, technologically (5-3)
  9. 20a Cut of meat from the side and back of an animal, taken between the ribs and the rump (4)
  10. 21a Smart trousers that end at the knees (7,6)
  11. 2d Eradicated (8)
  12. 3d Symbolic object (5)
  13. 4d Difficult to find (7)
  14. 5d Promotional words (5)
  15. 6d Great fire (7)
  16. 7d Criminal group (4)
  17. 11d Instrumentalist, such as James Galway (8)
  18. 13d Device that encodes images digitally and stores them for later reproduction (abbr) (7)
  19. 14d Sliding chest compartments — boxer shorts (7)
  20. 16d Large African antelope (5)
  21. 17d Inuit home (5)
  22. 18d Fencing sword like a foil but with a heavier blade (4)