Complete
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1 9 11 14 21 22 24 17 2 15 8 18 3 4 12 23 5 10 16 19 25 6 20 7 13
  1. 1a Continue (2,2)
  2. 3a Left-hander (8)
  3. 9a Visible (2,5)
  4. 10a Intense pain (5)
  5. 11a Cicero's tongue (5)
  6. 12a Male relative (6)
  7. 14a Large inlet of the North Atlantic between Virginia and Maryland (10,3)
  8. 17a Words from a soapbox? (6)
  9. 19a Wake (5)
  10. 22a Fish (associated with a Schubert quintet?) (5)
  11. 23a Relevant to the subject in question (2-5)
  12. 24a Unmerciful (8)
  13. 25a Pony carriage (4)
  14. 1d Severe traffic jam (8)
  15. 2d Beginning (5)
  16. 4d All keyed up — note to honkers (anag) (2,11)
  17. 5d Vagrant (5)
  18. 6d Adage (7)
  19. 7d Methods (4)
  20. 8d Things to cover (that may be hidden?) (6)
  21. 13d Biennial international golf tournament (5,3)
  22. 15d Heroic feat (7)
  23. 16d Martial art (6)
  24. 18d Praise highly (5)
  25. 20d Part of a shoe (5)
  26. 21d Heavenly light (4)