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 all the 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 Jonesin', The New York Times and The Globe and Mail.

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