Coming back with “Nonsense!” surprise you (4)

I believe the answer is:

stun

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'surprise you' is the definition.
'stun' can be an answer for 'surprise' (stunning is a kind of surprising). I'm unsure of the 'you' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for stun that I've seen before include "Knock cold" , "Render insensitive" , "Numb with nuts" , "Render temporarily senseless" , "Confuse" .)

I've seen this clue in the Evening Standard.

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