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 Depending on one's own resources (4-7)
  2. 7a Flog — band (4)
  3. 8a Supplementary text tacked on to the end (8)
  4. 9a Narcotics (7)
  5. 11a Same as above (5)
  6. 13a Wine residue (5)
  7. 14a Spiv (4,3)
  8. 16a Leave of absence from military duties (8)
  9. 17a Attendance figure (4)
  10. 18a Noisy and rhetorical (11)
  11. 1d Stain (on one's character?) (4)
  12. 2d Wrinkled (7)
  13. 3d Clearing in a wood (5)
  14. 4d Take 9 intravenously (8)
  15. 5d Behave promiscuously (5,6)
  16. 6d Dependable (11)
  17. 10d Candied stalks used as cake decoration (8)
  18. 12d Arrogant person (3-4)
  19. 15d Biblical betrayer (5)
  20. 17d Enjoyable — moral (4)