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All answers having "Informant" as clue:

3 Character Answers:

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RAT



4 Character Answers:

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FINK



5 Character Answers:

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NAMER



6 Character Answers:

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SNITCH

SOURCE



7 Character Answers:

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RATFINK

STOOLIE

TIPSTER



8 Character Answers:

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SQUEALER



11 Character Answers:

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STOOLPIGEON