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 Style of neat round handwriting (11)
  2. 7a Implore (4)
  3. 8a Dearth (8)
  4. 9a Animate — breathe in (7)
  5. 11a Bedeck (5)
  6. 13a Signs of what's to come (5)
  7. 14a Small clump of trees (7)
  8. 16a Steadfast (8)
  9. 17a Jupiter (4)
  10. 18a Garden plant — re-do the pork (anag) (3-3,5)
  11. 1d Nimble (4)
  12. 2d Spare time (7)
  13. 3d Satirical imitation (5)
  14. 4d Extinct mammal resembling an elephant (8)
  15. 5d Accurate clock (11)
  16. 6d Busy bee (5,6)
  17. 10d Gin-based cocktail with grenadine (4,4)
  18. 12d Gravestone inscription (7)
  19. 15d What's passed in a relay race (5)
  20. 17d Gag (4)