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 It should calm you down (8)
  2. 5a UK's largest kind of beetle (4)
  3. 9a Supermarket walkway (5)
  4. 10a Deceptively clever? (7)
  5. 11a Start (12)
  6. 13a Firstborn (6)
  7. 14a Overused phrase (6)
  8. 17a Pompous jargon (informal) (12)
  9. 20a Subtlety (7)
  10. 21a Very eccentric (informal) (5)
  11. 22a In 1906, 'terminological inexactitude', is what Winston Churchill called one of these (4)
  12. 23a Surrender — deny (8)
  13. 1d Imitation (4)
  14. 2d Lack of agreement (7)
  15. 3d It'll keep your drink hot (or cold) (7,5)
  16. 4d Unoccupied (6)
  17. 6d Double (5)
  18. 7d Ambitious individual (2-6)
  19. 8d Telling niece (anag) — secret information (12)
  20. 12d Vindictive (8)
  21. 15d Balkan country (7)
  22. 16d Rightly or wrongly, for example (6)
  23. 18d Overindulge (5)
  24. 19d Small cheeky child (4)