Complete
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7 9 13 16 5 18 1 10 2 8 15 14 3 12 11 4 17 6
  1. 5a Sailor's trousers (4-7)
  2. 7a Pack away tightly (4)
  3. 8a In use (8)
  4. 9a Ease off (7)
  5. 11a Charmingly eccentric (informal) (5)
  6. 13a Get someone in trouble by planting false evidence (5)
  7. 14a In a terrible state — of anger (anag) (3,4)
  8. 16a Condition characterised by a set of associated symptoms (8)
  9. 17a Sweetheart (informal) (4)
  10. 18a Departure (5-6)
  11. 1d Crab's pincer (4)
  12. 2d Cavity containing most of our guts (7)
  13. 3d Bit of rock (or celery?) (5)
  14. 4d Device for connecting rolling stock (8)
  15. 5d Fierce dispute (6,5)
  16. 6d Camper's resting place (8,3)
  17. 10d Amusing person (8)
  18. 12d Move aside (4,3)
  19. 15d Courted (5)
  20. 17d Edge (4)