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Pro ___ (4)

Ross

There are a few possibilities for this:

Which length description are you looking for?:

3 4 6

3*

'pro' 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 "Unreturnable serve" , "first-class" , "Player who excels" , "Brilliant" , "Tennis serve that the receiver can't reach" .)

I've seen this clue in the LA Times, The New York Times, the USA Today, The Times, The Star Tribune, The Sun, the Canadiana, the Penny Press and The Guardian.
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