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All answers having "Bonkers" as clue:

3 Character Answers:

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APE

MAD

RHO



4 Character Answers:

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AMOK

BATS

CRAY

DAFT

GAGA

LOCO

NUTS

ZANY



5 Character Answers:

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BATTY

CRAZY

DAFFY

DOTTY

GONZO

LOONY

LOOPY

NUTSO

NUTSY

NUTTY

POTTY

WACKO

WACKY



6 Character Answers:

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CLARET

INSANE

LOONEY

MENTAL

SCATTY



7 Character Answers:

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BANANAS

HAYWIRE



10 Character Answers:

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OFFTHEWALL



12 Character Answers:

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CRAZYASALOON