Just right, just right, OK? (2-2)

I believe the answer is:

so-so

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

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

(Other definitions for so-so that I've seen before include "Nothing to write home about" , "just about adequate" , "Indifferently good" , "Neither good nor bad" , "OK, but nothing special" .)

I've seen this clue in The Times.

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