Crossword Genius

Really good service (3)

Ross

I believe the answer is:

ace

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'good service' is the definition.
(a good serve in tennis)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ace that I've seen before include "Person who excels, a top card" , "The opponent can't return this serve" , "Excellent" , "One; A1" , "unit > of highest quality" .)

I've seen this clue in The Sun.
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