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All answers having "Flutter" as clue:

3 Character Answers:

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ADO

BAT

FAN

RHO



4 Character Answers:

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FLAP

FLIT

KICK

WAVE



5 Character Answers:

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FLAFF

HOOHA

HOVER

WAGER

WAVER



6 Character Answers:

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GAMBLE

TREMOR



9 Character Answers:

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SKIPABEAT