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 Founder of the Mongol empire, d. 1227 (7,4)
  2. 7a A good deal (4)
  3. 8a Comprehend (8)
  4. 9a US lexicographer — Jacobean playwright (7)
  5. 11a Decorate (5)
  6. 13a Furious (5)
  7. 14a 29 February (4,3)
  8. 16a American aubergine (8)
  9. 17a Spruce up (4)
  10. 18a Ordinary soldiers (4,3,4)
  11. 1d Begrudge (4)
  12. 2d Something huge (7)
  13. 3d Seize wrongfully (5)
  14. 4d Disinfectant used by farmers (5,3)
  15. 5d One of two nameless, but important, roles in Hamlet, Act V, scene 1 (11)
  16. 6d Refuse to give up (5,3,3)
  17. 10d Jumping (with a rope?) (8)
  18. 12d Groups or sets of seven (7)
  19. 15d Commonplace (5)
  20. 17d Tease — nincompoop (4)