Crossword Genius

There can be only one winner (3)

Ross

I believe the answer is:

ace

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'winner' is the definition.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for ace that I've seen before include "Virtuoso" , "Hole in one; card" , "Card with a single pip" , "One-spotted card" , "hotshot" .)

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