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All answers having "Clumsy person" as clue:

3 Character Answers:

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APE

OAF



4 Character Answers:

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CLOD



5 Character Answers:

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KLUTZ



6 Character Answers:

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LUBBER

LUMMOX



7 Character Answers:

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BUNGLER



10 Character Answers:

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CLODHOPPER



13 Character Answers:

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BUTTERFINGERS