Complete
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6 8 10 13 16 19 21 7 1 18 17 2 9 15 14 3 12 20 11 4 5
  1. 1a Home for stingers? (5,4)
  2. 8a Signal warning of danger (5)
  3. 9a Large American smoked meat sausage (7)
  4. 10a Nerdy fashion? (4,4)
  5. 11a Emmets (4)
  6. 13a Almost (6)
  7. 14a Italian-style ice cream (6)
  8. 16a Carnal desire (4)
  9. 17a Gradually (3,2,3)
  10. 19a Imaginary line around the Earth, equidistant from both poles (7)
  11. 20a Pacific, for example (5)
  12. 21a Pretty shoddy (5-4)
  13. 1d (Of heifers) pregnant (4,4)
  14. 2d Put forward (6)
  15. 3d Only one (4)
  16. 4d Marble sculptures from the Parthenon in Athens now held in the British Museum (5,7)
  17. 5d Firing at clay pigeons (4,8)
  18. 6d Constituency where the MP has an uncomfortably small majority (8,4)
  19. 7d A certain something (2,2,4,4)
  20. 12d Town in south-west Wales, with a Norman castle where Henry Tudor, later King Henry VII, was born (8)
  21. 15d Range of jagged-peaked mountains (6)
  22. 18d It can get screwed into a boot (4)