Lost for words (10)

I think it could be either:

Which length description are you looking for?:

speechless

'lost for words' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for speechless that I've seen before include "Unable to say anything" , "In shock" , "Dumbstruck" , "Dumbfounded" , "Lost for words" .)

I've seen this clue in The Telegraph, The Guardian and The Independent.

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