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 Area of muddy or boggy ground (6)
  2. 4a Deplorable (6)
  3. 9a The Treasure State (7)
  4. 10a Should (5)
  5. 11a Indian monetary unit (5)
  6. 12a Alumni (3,4)
  7. 13a Large bird found in mountainous parts of the northern hemisphere (6,5)
  8. 18a Climb with difficulty (7)
  9. 20a One who's up? (5)
  10. 22a Sticky substance exuded by fir trees (5)
  11. 23a Wide area (7)
  12. 24a Less burdensome (6)
  13. 25a A horse (anag) — on the beach? (6)
  14. 1d ROM or RAM (6)
  15. 2d Preliminary period (3-2)
  16. 3d Marine algae (7)
  17. 5d Egg-shaped (5)
  18. 6d Type of biscuit (3,4)
  19. 7d Most recent (6)
  20. 8d Systematic attempt to undermine opponents' morale (3,2,6)
  21. 14d Aristotle __ , Greek shipping magnate, d.1975 (7)
  22. 15d To the point (7)
  23. 16d Accumulate (6)
  24. 17d English novelist, Graham, d. 1991 (6)
  25. 19d Head (slang) (5)
  26. 21d Haven't a clue! (informal) (5)