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All answers having "Tell all" as clue:

3 Character Answers:

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RAT



4 Character Answers:

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BARE

BLAB

FESS

SING



5 Character Answers:

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SPILL



6 Character Answers:

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FESSUP

SNITCH

TATTLE



7 Character Answers:

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CONFESS

UNBOSOM



9 Character Answers:

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COMECLEAN

NAMENAMES



13 Character Answers:

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SPILLTHEBEANS