Fair copy? (2-2)

I believe the answer is:

so-so

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the remainder of the clue works.

(Other definitions for so-so that I've seen before include "Rather middling" , "Nothing to write home about" , "Mediocre" , "Tolerable, indifferent" , "Of middling quality" .)

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