words with 'er', 'ir' and 'ur'

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Across
  1. 1. a person who works with a doctor
  2. 3. where a clown works
  3. 6. spread this on bread or crackers
  4. 7. not a father
  5. 9. a animal's hair
  6. 10. an animal that can fly
Down
  1. 2. not a madam
  2. 4. not a brother
  3. 5. mix red and blue for this colour
  4. 6. not a clear picture
  5. 8. not him
  6. 9. a type of tree