Complete
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6 8 10 13 16 19 21 7 1 18 17 2 9 15 14 3 12 20 11 4 5
  1. 1a National flag (5,4)
  2. 8a Submarine (1-4)
  3. 9a Hair hanging in concentric circles (7)
  4. 10a South Asian country with the second largest Muslim population in the world (8)
  5. 11a Butt (4)
  6. 13a Visible in the distance (6)
  7. 14a Code word for S (6)
  8. 16a Encourage (4)
  9. 17a Behaving in an artificial way (8)
  10. 19a Sweet substance containing nuts (7)
  11. 20a Familiar (5)
  12. 21a Melancholy 1965 Beatles song (9)
  13. 1d Not yet proven (8)
  14. 2d Encroachment — ordain (anag) (6)
  15. 3d Something you mustn't do (2-2)
  16. 4d Repetition of sounds in a sentence (12)
  17. 5d Water sport (12)
  18. 6d Nursery rhyme character (6,6)
  19. 7d Mirror (7,5)
  20. 12d 26 times a year (8)
  21. 15d Commit a crime (6)
  22. 18d Dossier (4)