Crossword Genius

Score 100% on (3)

Ross

I believe the answer is:

'score 100% on' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ace that I've seen before include "strained" , "Winning serve; hole in one" , "Playing card with a single symbol" , "Outstanding" , "One in playing-cards" .)

I've seen this clue in The New York Times, the Universal and the USA Today.
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