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All answers having "Villains" as clue:

4 Character Answers:

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CADS

CURS

RIND



5 Character Answers:

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HEELS



6 Character Answers:

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KNAVES

ROGUES



7 Character Answers:

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BADGUYS

MEANIES

NASTIES



8 Character Answers:

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SNEERERS



9 Character Answers:

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CRIMINALS