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All answers having "Snitch" as clue:

3 Character Answers:

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COP

RAT

RHO



4 Character Answers:

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BLAB

FINK

NARC

SING

TELL



5 Character Answers:

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NAMER

RATON

SWIPE



6 Character Answers:

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PILFER

SQUEAL

TATTLE

TELLON



7 Character Answers:

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RATFINK

STOOLIE

TATTLER



8 Character Answers:

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INFORMER

TELLTALE



10 Character Answers:

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TATTLETALE



11 Character Answers:

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STOOLPIGEON