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 Deliberately harmful (9)
  2. 8a Work hard (4)
  3. 9a Death and decay of body tissue (8)
  4. 10a Floor level of a building (6)
  5. 11a Inferior — worthless (6)
  6. 13a Crowd (6)
  7. 15a Lying on one's back (6)
  8. 16a Reimbursement for goods damaged in transit (8)
  9. 18a Small insect-eating songbirds (4)
  10. 19a Unproductive (9)
  11. 1d Australian animal — a no-go ark (anag) (8)
  12. 2d Small boat propelled with oars (6)
  13. 3d Small finch, once popular as a caged songbird (6)
  14. 4d Sound of a contented cat (4)
  15. 6d Arrow makers (9)
  16. 7d Without revealing who you are (9)
  17. 12d Jobs for the boys (8)
  18. 14d Without charge (6)
  19. 15d Malodorous (6)
  20. 17d Not functioning properly (4)