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All answers having "Crestfallen" as clue:

3 Character Answers:

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SAD



4 Character Answers:

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BLUE



6 Character Answers:

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DASHED



8 Character Answers:

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DISMAYED



11 Character Answers:

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DOWNHEARTED



12 Character Answers:

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DISHEARTENED



13 Character Answers:

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SICKASAPARROT