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 William Frederick Cody, d. 1917 (7,4)
  2. 7a Small and weak (4)
  3. 8a Wife of Odysseus (8)
  4. 9a Extravagantly indulgent (7)
  5. 11a Potatoes (informal) (5)
  6. 13a Sediment (5)
  7. 14a Portable computers (7)
  8. 16a Marriage ceremony (8)
  9. 17a Colours (4)
  10. 18a US state, capital Pierre (5,6)
  11. 1d Dodgy (4)
  12. 2d Raising trivial objections (7)
  13. 3d Tied — limit (5)
  14. 4d First country to which Gulliver travelled (8)
  15. 5d Short musket with a flared muzzle (11)
  16. 6d Tepid or pale (anag) — butterflies and moths (11)
  17. 10d Legitimate (8)
  18. 12d Mobilise — US law-enforcement officer (7)
  19. 15d Hidden store (5)
  20. 17d Owl's cry (4)