Complete
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1 9 11 16 18 22 24 13 2 14 3 19 8 12 23 4 25 5 10 15 20 6 21 7 17
  1. 1a A real stinker? (3,3)
  2. 4a Gossamer trap (6)
  3. 9a Internet seminar (7)
  4. 10a Problem? (5)
  5. 11a Helicopter lifter (5)
  6. 12a Cricket's 'on' (3,4)
  7. 13a Out-of-this world travel (5,6)
  8. 18a American pit viper (informal) (7)
  9. 20a Vice ___ (Latin) (5)
  10. 22a Tusk substance (5)
  11. 23a Father, Son and Holy Spirit (7)
  12. 24a Contemporary (6)
  13. 25a Bottom (6)
  14. 1d Watch out for (6)
  15. 2d Accounting entry recording sums that are 5 (5)
  16. 3d Non-specific (7)
  17. 5d Unpaid (5)
  18. 6d Splenetic (7)
  19. 7d Bitter maker? (6)
  20. 8d Snowball (11)
  21. 14d Tins for mogs and dogs? (3,4)
  22. 15d Statement of money to be paid (7)
  23. 16d Obviously correct and verified statement (6)
  24. 17d Huckleberry Finn's friend Tom ___ (6)
  25. 19d Coating (5)
  26. 21d BBC's first Director-General, d. 1971 (5)