Vocabulary building (Refugee) Crossword

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Across
  1. 2. Hiker's gear bag worn on the shoulders (8)
  2. 5. Professional who bridges language gaps (10)
  3. 7. Ten hundred (8)
  4. 9. Incapable of being seen (9)
  5. 15. Paid expert, opposed to an amateur (12)
  6. 16. a criminal killer (8)
  7. 17. Commuter on a bus, train or boat(9)
  8. 19. Chuckle, giggle, or crack up (5)
  9. 21. Permit or give the green light to (5)
  10. 23. Wailing emergency vehicle warning (5)
Down
  1. 1. Easily recognised or well-known (8)
  2. 3. Purring newborn pet (6)
  3. 4. Feeling of annoyance when blocked from a goal (11)
  4. 6. Unbending line, or a poker hand of five consecutive cards (8)
  5. 8. Caribbean island nation famous for cigars and vintage cars (4)
  6. 10. Unpleasant dream that wakes you up (9)
  7. 11. Lost, absent, or nowhere to be found (7)
  8. 12. Highly pleasing to the eye (9)
  9. 13. Flat and level, opposite of vertical (10)
  10. 14. Small boat (6)
  11. 18. Put under heavy pressure or tension (6)
  12. 20. Vital organ associated with love and valentines
  13. 22. Good for nothing or serving no purpose (7)