Complete
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8 10 13 16 6 5 19 1 17 2 9 14 3 11 15 4 12 18 7
  1. 5a Be very expensive (4,1,4)
  2. 8a Diaphragm that controls the size of the pupil (4)
  3. 9a Dry (8)
  4. 10a Superbrain (6)
  5. 11a Part of a poem (6)
  6. 13a Bust (6)
  7. 15a Coiffure (6)
  8. 16a Oriental sabre (8)
  9. 18a Skin complaint (4)
  10. 19a Arms smuggler (9)
  11. 1d Lever used by pilot (8)
  12. 2d Position in society (6)
  13. 3d Superior of a religious community (6)
  14. 4d Things that get fired (abbr) (4)
  15. 6d Nietzsche or Engels (9)
  16. 7d Chinese Communist leader (3,6)
  17. 12d Lively (8)
  18. 14d Essential characteristics (6)
  19. 15d Engaging (6)
  20. 17d Pout (4)