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 Gave in (11)
  2. 7a Tie (or what one puts in it?) (4)
  3. 8a Pass across (8)
  4. 9a Enduring energy (7)
  5. 11a Playing card (5)
  6. 13a Leather strap once used on Scottish schoolchildren (5)
  7. 14a Steer (7)
  8. 16a Tending (8)
  9. 17a Post (4)
  10. 18a Low-cut neckline (11)
  11. 1d Notice — fictional puppy (4)
  12. 2d Drugs taken to reduce blood cholesterol (7)
  13. 3d Offering little hope (5)
  14. 4d Heavenly (8)
  15. 5d Reticent (11)
  16. 6d Very damaging (11)
  17. 10d Lose — limp case (anag) (8)
  18. 12d Turned sour (7)
  19. 15d Human joint (5)
  20. 17d Flesh as food (4)