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All answers having "Con artist" as clue:

4 Character Answers:

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LIAR



5 Character Answers:

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DUPER

FAKER

FRAUD

HOSER



6 Character Answers:

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FORGER



7 Character Answers:

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FLEECER

GRIFTER

SCAMMER

SHYSTER



8 Character Answers:

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CHISELER

SWINDLER



9 Character Answers:

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FRAUDSTER



10 Character Answers:

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HOODWINKER