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 Technical researcher (6)
  2. 4a No longer open (6)
  3. 9a Resolute in the face of pain — austere (7)
  4. 10a Land attached to a parish church (5)
  5. 11a Punctuation mark (5)
  6. 12a Presume — rue miss (anag) (7)
  7. 13a Uninvited guest (11)
  8. 18a Disconcerted (7)
  9. 20a Burst open (5)
  10. 22a System of religious principles (5)
  11. 23a Put on a pedestal (7)
  12. 24a Impressionist painter of British nationality, d. 1899 (6)
  13. 25a Plato's birthplace (6)
  14. 1d Essential principles (6)
  15. 2d Weak and delicate (5)
  16. 3d Deeply emotional (7)
  17. 5d German pistol (5)
  18. 6d Incapable of reproducing (7)
  19. 7d Make stronger (6)
  20. 8d Filled with a feeling of dread (5-6)
  21. 14d Stag's crowning glory (7)
  22. 15d Have qualms about (7)
  23. 16d Spring-flowering plant (6)
  24. 17d Emotional tension (6)
  25. 19d Long-handled spoon (5)
  26. 21d Rent — easel (anag) (5)