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All answers having "Blackguard" as clue:

3 Character Answers:

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CAD

CUR

RAT



4 Character Answers:

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HEEL

OGRE



5 Character Answers:

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KNAVE

LOUSE

ROGUE



6 Character Answers:

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RASCAL

ROTTER

SLEAZE



8 Character Answers:

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SCALAWAG