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 Preoccupation with buying things (11)
  2. 7a SOS! (4)
  3. 8a Perchance (8)
  4. 9a Country with French, Dutch and German as its official languages (7)
  5. 11a Blowing a gale? (5)
  6. 13a Twenty (5)
  7. 14a Moulding between ceiling and top of a wall (7)
  8. 16a Fashionable ornament — signer on (anag) (4,4)
  9. 17a Diamonds, say (4)
  10. 18a Proviso (11)
  11. 1d Very good buy (4)
  12. 2d Extra (7)
  13. 3d Thick (5)
  14. 4d From Palermo? (8)
  15. 5d Smarty-pants (6,5)
  16. 6d Calling down a curse (11)
  17. 10d Plant — drainage (anag) (8)
  18. 12d Become semi-solid on cooling (7)
  19. 15d Hole in the head? (5)
  20. 17d Front part of the human leg (4)