Not no (3)

I believe the answer is:

yes

'not no' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for yes that I've seen before include "Affirmative response" , "Agreed" , "Oui" , "I agree" , "Yea" .)

I've seen this clue in the USA Today, the Evening Standard and the Family Time.

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