Crossword Genius

He'll always have a good shot (3)

Ross

I believe the answer is:

ace

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

(Other definitions for ace that I've seen before include "rare driving result?" , "One in playing-cards" , "Outstanding" , "Virtuoso" , "Tennis winner" .)

I've seen this clue in the Evening Standard.
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