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 Very fast-moving river current (6)
  2. 4a Unit of astronomical distance (about 3.26 light years) (6)
  3. 9a Rice — aim tabs (anag) (7)
  4. 10a ___ Without a Cause (1956 James Dean film) (5)
  5. 11a Scrap (3-2)
  6. 12a Proceeding slowly (7)
  7. 13a George Eliot novel, first of eight volumes published in 1871 (11)
  8. 18a Travel regularly (7)
  9. 20a Hilarity (5)
  10. 22a Songlike poem (5)
  11. 23a Staggered (7)
  12. 24a Alleviation (6)
  13. 25a Alumnus (3,3)
  14. 1d Hale and hearty (6)
  15. 2d Assume to be the case (5)
  16. 3d Jewel (7)
  17. 5d Large trunk artery (5)
  18. 6d Dark formal clothing (worn during exams at some universities) (7)
  19. 7d Without agitation (6)
  20. 8d Song about sleigh riding (6,5)
  21. 14d Wicked (7)
  22. 15d Butterfly (red or white) (7)
  23. 16d Concerning the eye (6)
  24. 17d Of inferior quality (6)
  25. 19d Male relative (5)
  26. 21d 2006 Amy Winehouse song (5)