Complete
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1 8 11 14 18 20 22 2 19 17 10 3 9 4 16 15 5 21 23 6 12 7 13
  1. 1a Inventor of the ballpoint (4)
  2. 3a Mad — hen dug in (anag) (8)
  3. 8a Youngsters (4)
  4. 9a Laws (8)
  5. 11a Entitled to high esteem (10)
  6. 14a Portuguese capital (6)
  7. 15a Spanish fleet sent in 1588 to escort an invasion of England (6)
  8. 17a Able to grasp an object — Helen is rep (anag) (10)
  9. 20a Dissertation (8)
  10. 21a Young deer (4)
  11. 22a At once (8)
  12. 23a Marine mammal (4)
  13. 1d Place to escape from danger (8)
  14. 2d Discourtesy (8)
  15. 4d Acceptable (3,3)
  16. 5d Lacking respect for the beliefs of others (10)
  17. 6d Fortitude and determination (4)
  18. 7d Drug (4)
  19. 10d Totalitarian (10)
  20. 12d Fence consisting of stakes (8)
  21. 13d Motherly (8)
  22. 16d Hand tool (6)
  23. 18d Small rounded earring (4)
  24. 19d Mock (4)