When 'or' sound like 'eh'

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Across
  1. 2. element contributing to a result
  2. 5. a mistake
  3. 6. consultant or mentor
  4. 7. film maker
  5. 8. writer of books
  6. 10. one who hoards specific items
  7. 14. car's turning light
  8. 16. someone who is a guest in your home
  9. 17. a judge of a situation
  10. 19. choir director
  11. 20. aged citizen
Down
  1. 1. dramatic performer
  2. 2. fail to remember
  3. 3. story teller
  4. 4. police rank
  5. 9. someone who builds
  6. 11. member of a conspiracy
  7. 12. one practising medicine
  8. 13. one who manages a meeting
  9. 15. swamp reptile
  10. 18. compatibility device