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All answers having "Have fun" as clue:

4 Character Answers:

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LARK

PLAY



5 Character Answers:

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ENJOY



8 Character Answers:

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LIVEITUP

RECREATE



9 Character Answers:

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MAKEMERRY



15 Character Answers:

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KICKUPONESHEELS

LETDOWNYOURHAIR

LIVEITUPALITTLE