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All answers having "Perform" as clue:

2 Character Answers:

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DO



3 Character Answers:

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ACT

OAR

PLY



4 Character Answers:

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GIVE

PLAY



5 Character Answers:

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DOEST

DOETH

EMOTE

ENACT



6 Character Answers:

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APPEAR

BEHAVE

FUSION

RENDER



7 Character Answers:

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ACHIEVE

AMOROSO

EXECUTE

OPERATE

PLAYACT

TIDDLER



9 Character Answers:

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DISCHARGE