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 One of only two in the Church of England (10)
  2. 7a Hawaiian capital (8)
  3. 8a Deep wide chasm (4)
  4. 9a Dart (by moonlight?) (4)
  5. 10a Radio show where listeners can participate (5-2)
  6. 12a Swimming stroke — add old Peggy (anag) (5-6)
  7. 14a Rips etc (anag) (7)
  8. 16a Flushed (4)
  9. 19a Soothing ointment (4)
  10. 20a Message sent by wire and delivered in written form (8)
  11. 21a US president (10)
  12. 1d Distant (5)
  13. 2d Oversweet (7)
  14. 3d Pornographic (4)
  15. 4d Left-handed baseball pitcher (8)
  16. 5d Musical instrument — argon (anag) (5)
  17. 6d Flush with water (6)
  18. 11d Covering for one of two lookers? (8)
  19. 12d North-east English county (6)
  20. 13d Prolonged shortage (7)
  21. 15d Butterfly with orange and brown wings (5)
  22. 17d Feel great desire (for) (5)
  23. 18d Scheme (4)