Complete
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6 7 10 13 17 21 23 1 14 2 12 11 3 16 22 15 4 8 20 18 5 19 9
  1. 1a Keep going (10)
  2. 7a Pariah (7)
  3. 8a Promotional words on a book jacket (5)
  4. 10a Plug used to stop a hole (4)
  5. 11a Nit-picking (8)
  6. 13a Leading authority (6)
  7. 15a Cheapen (6)
  8. 17a National flower of Wales (8)
  9. 18a Hit hard (4)
  10. 21a Practice session (5)
  11. 22a Spend extravagantly (7)
  12. 23a Writing materials (10)
  13. 1d Hoax (3-2)
  14. 2d Genuine (4)
  15. 3d Each of two (6)
  16. 4d Not defeated (8)
  17. 5d Legal custodian (7)
  18. 6d Passionate (3-7)
  19. 9d Old newspaper or periodical (4,6)
  20. 12d Illuminated at night (8)
  21. 14d Trouble (7)
  22. 16d Shambles (6)
  23. 19d Make haste (5)
  24. 20d Inkling (4)