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 Someone unfamiliar with sailing (10)
  2. 7a Most abundant chemical substance in the universe (8)
  3. 8a Delighted (4)
  4. 9a Make a leonine noise (4)
  5. 10a Soft soap (from a stone in County Cork?) (7)
  6. 12a Somerset's annual performing arts festival (11)
  7. 14a Contemporary (7)
  8. 16a Highly excited (4)
  9. 19a Part of speech (4)
  10. 20a Praised fulsomely (8)
  11. 21a Bollinger and Veuve Clicquot, for example — weaken rims (anag) (10)
  12. 1d Creature that produces eggs? (5)
  13. 2d Ivan ran (anag) — American grunge band (7)
  14. 3d Racing sled (4)
  15. 4d Incompetent (8)
  16. 5d Keen (5)
  17. 6d To wit (6)
  18. 11d Prehistoric period (5,3)
  19. 12d Forced out (6)
  20. 13d Improvement — dear pug (anag) (7)
  21. 15d Jewish scholar (5)
  22. 17d Suppose (5)
  23. 18d Cat — sportswear brand (4)