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All answers having "Telltale ___" as clue:

4 Character Answers:

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BLAB

ODOR



5 Character Answers:

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SNEAK



6 Character Answers:

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SNITCH



7 Character Answers:

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TATTLER



8 Character Answers:

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INFORMER



9 Character Answers:

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INFORMANT



12 Character Answers:

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BLABBERMOUTH