number 4

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Across
  1. 3. jail (6)
  2. 5. shells found on the seashore (9)
  3. 7. a system where men have the power (9)
  4. 9. great or far-reaching importance (9)
  5. 12. costing very little (5)
  6. 13. proceeds after expenses (6)
  7. 14. first discovery, pioneering (14)
  8. 16. sworn statement, oath (9)
  9. 18. great, something exceptional (11)
  10. 21. conditions of a region,prevailing attitudes (7)
  11. 22. focused, intent on doing the task (2,3,4)
  12. 23. joy, contentment
  13. 25. to express vividly with emotion, exaggerated. (9)
  14. 27. right, the administrating of deserved rewards or punishment (7)
  15. 28. a person cant get a job without experience, but cant get experience without a job (5,2)
Down
  1. 1. disease caused by a lack of insulin (8)
  2. 2. exclusive possession of something (8)
  3. 4. completely separated (9)
  4. 6. to overwhelm often with a louder sound. (7,3)
  5. 8. suffering from the heat (10)
  6. 10. persevering, keeping on going (4,2,5)
  7. 11. a special right (9)
  8. 15. preserved in vinegar or brine (7)
  9. 17. antiaircraft fire, hostile reaction or criticism (4)
  10. 19. a depression in the landscape, a low point (6)
  11. 20. becoming weaker, getting tired (8)
  12. 24. act of analysing, passing judgement (9)
  13. 26. grand, dignified (8)