Leave gobsmacked

I think it could be either:

Which length description are you looking for?:

stun

'leave gobsmacked' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for stun that I've seen before include "Daze with nuts" , "Daze, knock senseless" , "Put out for the count" , "Surprise greatly, knock someone''s socks off" , "Knock unconscious" .)

I've seen this clue in the USA Today.

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