THE IMPOSSIBLE CROSSWORD

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Across
  1. 1. Alumni (4)
  2. 4. Bat, Beam (8)
  3. 5. Impatient(5)
  4. 8. Drawing (12)
  5. 9. White Heron (5)
  6. 11. Jamaican Fruit (5)
  7. 14. King Arthur's castle (7)
  8. 16. Ariana (6)
  9. 19. Northwesten city in ireland (5)
  10. 20. Picture of many parts (6)
  11. 23. Nurse (4,2)
  12. 24. Honorary university head (10)
Down
  1. 2. Stairs (collqu)(6,3,5)
  2. 3. Tispy (10)
  3. 6. Self Denial (7)
  4. 7. Roman emperor (8)
  5. 10. Calculated (8)
  6. 12. Colds that last a long time (7)
  7. 13. Riddle (9)
  8. 15. Whirlybird (9)
  9. 17. Murder (5)
  10. 18. They come in last (3)
  11. 21. Yes (3)
  12. 22. Goes badly wrong (5)