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All answers having "Buzz off!" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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SCAT

SHOO



5 Character Answers:

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LEAVE

SCRAM



6 Character Answers:

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BITEME



10 Character Answers:

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GOFLYAKITE



17 Character Answers:

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ENGELBERTPERDINCK