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All answers having "Idle chatter" as clue:

3 Character Answers:

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GAB



4 Character Answers:

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BLAB



7 Character Answers:

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PALAVER

PRATTLE

TWADDLE



9 Character Answers:

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SMALLTALK



10 Character Answers:

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YACKETYYAK



11 Character Answers:

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YACKETYYACK



12 Character Answers:

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TITTLETATTLE