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All answers having "FUN" as clue:

3 Character Answers:

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FUN

KID

REC



4 Character Answers:

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AGAS

GAME

JEST

NEAT

POKE

SOME

SUCH



5 Character Answers:

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HUMOR

KICKS

MIRTH

SPORT

TBIRD



8 Character Answers:

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PLEASURE



9 Character Answers:

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AMUSEMENT

MERRIMENT



10 Character Answers:

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RECREATION



12 Character Answers:

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THEBEACHBOYS