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 Edge — border (9)
  2. 8a Infantry — unit of linear measure (4)
  3. 9a Ambridge (anag) — eg grouse (4,4)
  4. 10a Small rounded stone (6)
  5. 11a Punched (6)
  6. 13a Shade of blue (6)
  7. 15a Fall (6)
  8. 16a Insinuation (8)
  9. 18a Culinary herb (4)
  10. 19a Captivated (9)
  11. 1d Segment of the spine (8)
  12. 2d Silly laugh (6)
  13. 3d River at Henley (6)
  14. 4d Worm-like larva of an insect (4)
  15. 6d Regain consciousness (4,5)
  16. 7d Crisp skin of a pork joint (9)
  17. 12d Bear in mind (8)
  18. 14d Arctic plain (6)
  19. 15d Prickly plants (6)
  20. 17d Longer of the two forearm bones (4)