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All answers having "Feign" as clue:

3 Character Answers:

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ACT



4 Character Answers:

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FAKE

SEEM

SHAM



5 Character Answers:

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PUTON



6 Character Answers:

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AFFECT

ASSUME



7 Character Answers:

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PRETEND



8 Character Answers:

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SIMULATE



9 Character Answers:

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DISSEMBLE



10 Character Answers:

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PLAYPOSSUM

PUTONANACT