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 Posh nosh bar? (9)
  2. 8a Work bonus? (4)
  3. 9a Locus (8)
  4. 10a Go without food (6)
  5. 11a Eyed vegetable? (6)
  6. 13a Interview to canvass opinion (3,3)
  7. 15a Soft and downy (6)
  8. 16a Vernal, aestival, autumnal or brumal? (8)
  9. 18a Argyle-patterned woollen item? (4)
  10. 19a Play down – adopt self (anag.) (4-5)
  11. 1d Stage cloth (8)
  12. 2d Plates (anag.) (6)
  13. 3d Anybody's game? (4-2)
  14. 4d By a hair's breadth (4)
  15. 6d Small fast warship (9)
  16. 7d Complete change of policy (5-4)
  17. 12d Part of the week when Thanksgiving celebrated (8)
  18. 14d Donkey, e.g., filled with sweets? (6)
  19. 15d Padding (6)
  20. 17d Polluted air (4)