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 Regard – Nato mid-air (anag) (10)
  2. 7a Island nation southeast of India (3,5)
  3. 8a Vichyssoise vegetable (4)
  4. 9a Irritating buzzer? (4)
  5. 10a The B of GB (7)
  6. 12a Foreign policy of Ancient Rome (11)
  7. 14a Throw off course (7)
  8. 16a Slide (out of control) (4)
  9. 19a Lazy, unkempt individual (4)
  10. 20a Twilight hours (8)
  11. 21a One will create drama (10)
  12. 1d Pointer (5)
  13. 2d He's a weakling (7)
  14. 3d Sounded (true) (4)
  15. 4d Time for elevenses? (3,5)
  16. 5d Young bird of prey (5)
  17. 6d Average – means (6)
  18. 11d China (8)
  19. 12d Standards one aspires to live up to (6)
  20. 13d The least idea (7)
  21. 15d Defamatory comments in print (5)
  22. 17d Number (between zero and nine) (5)
  23. 18d Rip (4)