Clue 3

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Across
  1. 3. Worn by royalty
  2. 4. Simpsons character with brown hair
  3. 6. Birds part of the Columbidae family
Down
  1. 1. structures to drink, to bath, to decorate, to honour and to entertain.
  2. 2. Painted the Fighting Temeraire
  3. 5. Land mammals with a mane, displaying obvious sexual dimorphism