Crossword Genius

It's simply not fair (4)

Ross

I believe the answer is:

ugly

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'not fair' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for ugly that I've seen before include "Unpleasing to the eye" , "not tasty?" , "Far from beautiful" , "Extremely unattractive" , "Grotesque" .)

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