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All answers having "Slanders" as clue:

5 Character Answers:

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SLURS



6 Character Answers:

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SMEARS



7 Character Answers:

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DEFAMES

MALIGNS

MISSAYS

TRASHES



8 Character Answers:

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ASPERSES

BESMEARS



9 Character Answers:

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CALUMNIES



15 Character Answers:

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CASTSASPERSIONS