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 Golfing knickerbockers (4,5)
  2. 8a Strike — 1980s' pop group (4)
  3. 9a Term that is now fashionable (8)
  4. 10a High-ranking Ottoman official (6)
  5. 11a Make less (6)
  6. 13a OK, fine! (6)
  7. 15a Spectre (6)
  8. 16a Device for remembering things (8)
  9. 18a In this way (4)
  10. 19a Old gold coin (9)
  11. 1d Low in calories (8)
  12. 2d Line connecting points of equal atmospheric pressure (6)
  13. 3d Heavy drinker (6)
  14. 4d Mixture (4)
  15. 6d Manacled workers (5,4)
  16. 7d Grumpy (9)
  17. 12d (At sea) deviation from the intended course (8)
  18. 14d Braying animal (6)
  19. 15d Classified (6)
  20. 17d Open to argument (4)