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All answers having "--- wise guy!" as clue:

3 Character Answers:

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OHA

RHO

WAG



4 Character Answers:

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GURU

SAGE

SEER

YOGI



5 Character Answers:

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ALECK

SOLON

SWAMI



6 Character Answers:

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SAVANT

SMARTY



7 Character Answers:

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KNOWALL



8 Character Answers:

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SMARTASS



10 Character Answers:

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SMARTALECK



11 Character Answers:

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CLEVERCLOGS

SMARTYPANTS