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All answers having "Goof off" as clue:

4 Character Answers:

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FART

LAZE

LOAF

LOLL



5 Character Answers:

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DOGIT



8 Character Answers:

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LALLYGAG

LOLLYGAG



10 Character Answers:

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FOOLAROUND



11 Character Answers:

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HORSEAROUND



12 Character Answers:

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MONKEYAROUND