Crossword Genius

Sporting blonde just fine (4)

Ross

I believe the answer is:

fair

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But I can't explain it at all! Could you help me understand?

(Other definitions for fair that I've seen before include "Just - swings and roundabouts" , "Pretty good" , "Just; passable" , "likely" , "Blonde; impartial" .)

I've seen this clue in The Sun.
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