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 Score of three strokes under par for a golf hole (9)
  2. 8a Stare stupidly (4)
  3. 9a Pierce with a sharp point (8)
  4. 10a Mischievous child (6)
  5. 11a Be waiting for (6)
  6. 13a Largest New World vulture (6)
  7. 15a Thin — inadequate (6)
  8. 16a Derived support from (6,2)
  9. 18a Submissive (4)
  10. 19a Maybe (9)
  11. 1d Carelessly executed (8)
  12. 2d Speed up (6)
  13. 3d Polished — sophisticated (6)
  14. 4d Applications (4)
  15. 6d Car with a folding top — trace boil (anag) (9)
  16. 7d Identified by close investigation (9)
  17. 12d Dispensary (8)
  18. 14d Censor part of a text for security reasons (6)
  19. 15d Involving human effort (6)
  20. 17d Require(ment) (4)