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All answers having "Stun" as clue:

3 Character Answers:

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AWE

JAR

WOW

ZAP



4 Character Answers:

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DAZE

FAZE

JOLT

TASE



5 Character Answers:

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AMAZE

FLOOR

SHOCK



6 Character Answers:

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BEDAZE



7 Character Answers:

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CONCUSS

STUPEFY



8 Character Answers:

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ASTONISH

BOWLOVER



9 Character Answers:

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HITFORSIX

MIXEDNUTS



13 Character Answers:

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KNOCKFORALOOP