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 Upper figure in a fraction (9)
  2. 8a Comfortable — small secluded room (4)
  3. 9a 31 Dec for the Scots (8)
  4. 10a Brighton & Hove, West Bromwich or Burton FC (6)
  5. 11a Large-rooted vegetable related to the cabbage (6)
  6. 13a Amount left over (6)
  7. 15a Pointy beard (6)
  8. 16a Sleepy guest at the Mad Hatter's tea party (8)
  9. 18a Large book (4)
  10. 19a Warlike (9)
  11. 1d Bog (8)
  12. 2d Large female bird of the pheasant family (6)
  13. 3d Housefly larva (6)
  14. 4d Couch (4)
  15. 6d Change in a word's grammatical form — fix online (anag) (9)
  16. 7d Stuffing practice (9)
  17. 12d Try out how something works under realistic conditions (4,4)
  18. 14d In a way that shows excessive pride in oneself (6)
  19. 15d Hellenic Republic (6)
  20. 17d Very docile (4)