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All answers having "Louse" as clue:

3 Character Answers:

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CAD



4 Character Answers:

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HEEL



5 Character Answers:

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CREEP



6 Character Answers:

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COOTIE



7 Character Answers:

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SPOILER

STINKER



8 Character Answers:

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DIRTYRAT



9 Character Answers:

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NOGOODNIK

SCOUNDREL



11 Character Answers:

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DIRTYDEALER