He prefers things not so-so but just so (13)

I believe the answer is:

perfectionist

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'he prefers things not so-so but just so' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is all the clue.

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(Other definitions for perfectionist that I've seen before include "Striver for the ideal" , "I expect the best" , "The Stickler" , "One aiming for the best" , "One seeking the ideal" .)

I've seen this clue in The Globe and Mail.

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