Not just lacking in beauty? (6)

I believe the answer is:

unfair

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'not just' is the definition.
('unfair' is the opposite to 'just')

I can't explain the remainder of the clue.

(Other definitions for unfair that I've seen before include "Not equitable - or blonde?" , "Not equitable-or blonde?" , "raining perhaps?" , "deceitful" , "Not equitable or even-handed" .)

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