RBW Crozzie #6

1234567891011121314151617181920
Across
  1. 4. Classical instrument
  2. 5. Old woman in Russia
  3. 7. Powhatan princess
  4. 8. Defense Department set to delete this superbomber
  5. 9. Viral hemorrhagic fever
  6. 11. Ancient Japanese theatre form
  7. 12. Vital metal
  8. 15. Insectivore sounds Afrikaans in English
  9. 17. Enormous antipodean tree
  10. 18. Riverbank scavenger
  11. 19. Relatively autonomous systems
  12. 20. Happens by chance
Down
  1. 1. Like a favourite uncle
  2. 2. Exclusive fashion
  3. 3. Relaxed
  4. 6. Yearling sheep
  5. 10. Neither bear nor cat
  6. 13. Bitter attack
  7. 14. Grumpy move ... or decoration
  8. 16. Southern states of the US