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All answers having "Off one's rocker" as clue:

3 Character Answers:

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MAD

RHO



4 Character Answers:

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BATS

DAFT

GAGA

LOCO

NUTS



5 Character Answers:

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CRAZY

DIPPY

LOONY

NUTSO

NUTTY



6 Character Answers:

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ARISEN

CRAZED

INSANE

LOONEY

SCREWY



7 Character Answers:

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BONKERS



12 Character Answers:

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MADASAHATTER



15 Character Answers:

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MADASAMARCHHARE