Render speechless (4)

I think it could be either:

Which length description are you looking for?:

stun

'render speechless' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for stun that I've seen before include "Render insensitive" , "Make dazed or numb" , "cause amazement" , "Knock unconscious" , "Render temporarily senseless" .)

I've seen this clue in The New York Times and the Newsday.

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