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 Resemblance (10)
  2. 7a Politically, an unsafe seat (8)
  3. 8a Kind of golf club (4)
  4. 9a Sex Pistols genre (4)
  5. 10a Below (7)
  6. 12a Best-selling product of its type (5,6)
  7. 14a Continue moving forward (5,2)
  8. 16a Advantage (4)
  9. 19a Smoke outlet (4)
  10. 20a Complete and undamaged — triangle (anag) (8)
  11. 21a Forbidden (10)
  12. 1d Overwhelm completely (5)
  13. 2d Reddish purple (7)
  14. 3d Given temporarily (4)
  15. 4d Freed from anxiety (8)
  16. 5d Yours (archaic) (5)
  17. 6d Nose (slang) (6)
  18. 11d Rebuke (8)
  19. 12d Only just (6)
  20. 13d Great pleasure (7)
  21. 15d Absolute — diaphanous (5)
  22. 17d Sedate (5)
  23. 18d Small remaining piece (4)