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All answers having "Wacko" as clue:

3 Character Answers:

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MAD

NUT



4 Character Answers:

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DAFT

KOOK

LOCO

LOON

NUTS

ZANY



5 Character Answers:

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CRAZY

DITSY

GOOFY

LOONY

NUTSY

NUTTY



6 Character Answers:

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INSANE

LOONEY

NUTJOB



7 Character Answers:

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BANANAS

LUNATIC

ODDBALL



8 Character Answers:

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HEADCASE

UNHINGED