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All answers having "BAck talk" as clue:

3 Character Answers:

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LIP



4 Character Answers:

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ECHO

FLAK

GUFF

SASS

TUDE



5 Character Answers:

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SAUCE



6 Character Answers:

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STATIC



9 Character Answers:

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ECNELOSNI



10 Character Answers:

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BALAAMSASS