Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1a Send-up (6)
  2. 4a Cut meat, stone or wood (5)
  3. 7a Coming together of businesses (6)
  4. 8a Slender and graceful (6)
  5. 9a One gets over it as one gets older (4)
  6. 10a Underground energy source (4,4)
  7. 12a Regains Mali (anag) — place on the sidelines (11)
  8. 17a And so on (2,6)
  9. 19a Debatable (4)
  10. 20a Support for photography (6)
  11. 21a Line around an area to prevent entry (6)
  12. 22a Object used in playing chess (5)
  13. 23a Mixture of things from different sources (6)
  14. 1d Extra cost (7)
  15. 2d One often found in pub? (7)
  16. 3d Order issued from above (9)
  17. 4d Nit-pick (5)
  18. 5d Recovers in health or morale (7)
  19. 6d Time for a mid-morning something? (6)
  20. 11d Sudden appearance of an overwhelming mass (9)
  21. 13d Record store (7)
  22. 14d Degenerate (7)
  23. 15d Thrift (7)
  24. 16d Repressed (4-2)
  25. 18d Common theme (5)