Crossword Genius

Unreturned serve (3)

Ross

I believe the answer is:

ace

'unreturned serve' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ace that I've seen before include "unit > of highest quality" , "Top card or winning tennis serve" , "Entertain" , "Best type of tennis serve" , "Player who excels" .)

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