Crossword Genius

Unreturned tennis serve (3)

Ross

I believe the answer is:

ace

'unreturned tennis serve' 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 "Expert; one" , "1" , "Brilliant" , "One in playing-cards" , "Excellent" .)

I've seen this clue in the LA Times and the USA Today.
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