Think aloud? (3)

I think it could be either:

Which length description are you looking for?:

say

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'think' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

(Other definitions for say that I've seen before include "Express in words" , "State; for instance" , "Articulate" , "Utter; for example" , "Verbalise" .)

I've seen this clue in the Evening Standard.

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