My first attempt

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Across
  1. 3. Imbalanced
  2. 5. Speak
  3. 8. Winch
  4. 11. Washing powder
  5. 12. Composer of operettas
  6. 14. Musical accompaniment to an entrance
  7. 16. Cross country trekking
  8. 17. Lucky chance
  9. 18. Brother or sister
  10. 19. Cornish hero
  11. 20. Time piece
  12. 22. Study of time
  13. 23. Irrational
  14. 26. Seizing
  15. 27. Light fog
  16. 29. Donner and blitzen?
  17. 31. Manger
  18. 32. Steer
  19. 33. Investigation or analysis
  20. 36. skin
  21. 37. Novel by Pushkin
  22. 38. Finished with work
  23. 39. Ceiling fabric
Down
  1. 1. Hectic
  2. 2. Young dog
  3. 4. Campaign of revenge
  4. 6. Dried fruit
  5. 7. Ornate lighting feature
  6. 9. Relating to an empire
  7. 10. Broad minded person
  8. 13. Mythical story
  9. 15. Happen together
  10. 19. Soothing
  11. 21. Leader
  12. 24. Horse box
  13. 25. Rent
  14. 28. Assessing the severity of injuries
  15. 30. Fool
  16. 34. Cleanliness
  17. 35. Quarry