Crossword Genius

Unreturnable serves (4)

Ross

I believe the answer is:

aces

'unreturnable serves' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for aces that I've seen before include "never come back" , "Expert fliers" , "Playing cards with single pips on their faces" , "winning shots" , "They're high and low on cards" .)

I've seen this clue in the LA Times.
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