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All answers having "Double-dealing" as clue:

5 Character Answers:

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FALSE



6 Character Answers:

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ARTFUL

DECEIT

DUPERY

SNEAKY



8 Character Answers:

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TWOFACED



9 Character Answers:

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CHICANERY

DUPLICITY

TREACHERY

TWOTIMING



10 Character Answers:

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DISHONESTY



11 Character Answers:

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DUPLICITOUS