Crossword Genius

Somebody who is extremely special (3,2,1,7)

Ross

I believe the answer is:

one in a million

(Other definitions for one in a million that I've seen before include "someone very special? - with 24a" , "Wonderful person, almost unique?" , "Quite exceptional person" , "Gem; exceptional person" , "Rare or exceptional person or thing" .)

I've seen this clue in The Telegraph.
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