Crossword Genius

Maven (3)

Ross

I think it could be either:

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3

6

'maven' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for ace that I've seen before include "Tennis winner" , "unit > of highest quality" , "Unreturnable serve" , "Service that's never returned" , "Good; service; card" .)

I've seen this clue in The New York Times, the LA Times and the Penny Press.
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