That's what you think! (7)

I think it could be either:

Which length description are you looking for?:

opinion

'that's what you think' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for opinion that I've seen before include "Personal belief or judgment" , "Belief not founded on proof or certainty" , "Unproved belief or view" , "Belief or conviction" , "View, judgement" .)

I've seen this clue in The New York Times, the Jonesin' and The Globe and Mail.

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