Supposition (6)

I think it could be either:

Which length description are you looking for?:

theory

'supposition' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for theory that I've seen before include "General principles of a subject" , "Series of ideas seeking to explain something" , "can provide an explanation" , "Conjectural view" , "Explanatory idea" .)

I've seen this clue in the Evening Standard, The Telegraph, The Times, the Wall Street Journal, The Sun and The Guardian.

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