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All answers having "Weirdo" as clue:

3 Character Answers:

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NUT



4 Character Answers:

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GEEK

KOOK

ODDD



5 Character Answers:

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CREEP

FREAK

GHOUL

WACKO



6 Character Answers:

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MISFIT

NUTJOB

ODDITY



7 Character Answers:

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DEVIANT

NUTCASE

ODDBALL

ODDDUCK



9 Character Answers:

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SCREWBALL



10 Character Answers:

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FREAKAZOID