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 Rod and line, say (7,6)
  2. 8a Secondary school near Windsor that has produced more British MPs than any other (4)
  3. 9a Surfing gear (3,5)
  4. 10a Expert member of a highly skilled elite group (10)
  5. 12a Dance for high kickers (6)
  6. 14a 1960 horror film centred on the Bates Motel (6)
  7. 15a Kind of rent that's nominal? (10)
  8. 19a Harem in a Muslim palace — Rio's gale (anag) (8)
  9. 20a Support — rugby player (4)
  10. 21a Completely and finally (4,3,3,3)
  11. 2d Presenting an obstacle (2,3,3)
  12. 3d Suspicion (5)
  13. 4d Tiny baby (7)
  14. 5d Coach (5)
  15. 6d Polite (in an old-fashioned way) (7)
  16. 7d Permits (4)
  17. 11d Grey or black drawing medium (8)
  18. 13d Small iced confection in a paper container (7)
  19. 14d Leave a group by oneself (4,3)
  20. 16d One of the original 1969 Monty Python troupe (5)
  21. 17d Lark (5)
  22. 18d Flowerless plant with fronds (4)