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All answers having "Numbskull" as clue:

3 Character Answers:

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ASS

OAF

RHO

SAP



4 Character Answers:

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BOOB

BOZO

DODO

DOLT

DOPE

TWIT

YOYO



5 Character Answers:

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DUNCE

IDIOT

MORON

NINNY



6 Character Answers:

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MAUMET

STOOGE



7 Character Answers:

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AIRHEAD

DULLARD

JABRONI



8 Character Answers:

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BONEHEAD

IMBECILE



10 Character Answers:

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DUNDERHEAD



11 Character Answers:

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CHOWDERHEAD

CHUCKLEHEAD