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All answers having "Squealer" as clue:

3 Character Answers:

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PIG

RAT



4 Character Answers:

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FINK



5 Character Answers:

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PHINK



6 Character Answers:

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SNITCH



7 Character Answers:

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STOOLIE

TATTLER



10 Character Answers:

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TATTLETALE



11 Character Answers:

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STOOLPIGEON