Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 10 16 14 8 21 5 6 15 7 19
  1. 1a Brief overview (8)
  2. 5a Notion (4)
  3. 9a North-east Indian state, noted for its tea (5)
  4. 10a Disciple — to lapse (anag) (7)
  5. 11a Hunt the thimble or charades, perhaps (7,5)
  6. 13a Best bib and tucker (6)
  7. 14a Historic port of north Brittany (2-4)
  8. 17a Left out of pocket (5-7)
  9. 20a Binge (7)
  10. 21a Wryly caustic language (5)
  11. 22a The alternative to this? (4)
  12. 23a Less than popular high street fundraisers (informal) (8)
  13. 1d Drawback (4)
  14. 2d Choose not to do something (7)
  15. 3d Points in common (12)
  16. 4d Lacking transparency? (6)
  17. 6d Factual information (5)
  18. 7d Antipathy (8)
  19. 8d Well established (4-8)
  20. 12d By-product (8)
  21. 15d Solvent used to remove nail polish (7)
  22. 16d Roof straw (6)
  23. 18d Last Greek letter (5)
  24. 19d Runs but not off the bat (4)