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All answers having "Clumsy one" as clue:

3 Character Answers:

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APE

OAF



4 Character Answers:

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BOOR

CLOD

CLOT

LOUT



5 Character Answers:

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KLUTZ



7 Character Answers:

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BUMBLER



13 Character Answers:

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BUTTERFINGERS

FUMBLEFINGERS



16 Character Answers:

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BULLINACHINASHOP