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 Talented IT (anag) — amateur who pretends to be an expert? (10)
  2. 7a Consultant (7)
  3. 8a Pitfalls (5)
  4. 10a A warning to other motorists? (4)
  5. 11a Formal evening dress for men (5,3)
  6. 13a Affect adversely (6)
  7. 15a An amount of oil (or beer) (6)
  8. 17a Stream of invective (8)
  9. 18a High male voice (4)
  10. 21a Wash out the dirt (5)
  11. 22a Cheer up (7)
  12. 23a Acceptable — valid (10)
  13. 1d Bed consisting of a solid base and mattress (5)
  14. 2d A smaller amount (4)
  15. 3d Excitement (6)
  16. 4d Dictator (8)
  17. 5d Pop-up appliance (7)
  18. 6d Pioneer — fine art PhD (anag) (10)
  19. 9d Bewitched (10)
  20. 12d Benjamin, 1st Earl of Beaconsfield (8)
  21. 14d Arranged beforehand (7)
  22. 16d Think about something all the time (6)
  23. 19d Embankment built to prevent a river from flooding (5)
  24. 20d Give the game away (4)