Crossword Genius

Expert (3)

Ross

'expert' is the definition.
(ace can informally mean very good)

This is the entire clue.

(Other definitions for ace that I've seen before include "Very good; playing card" , "reason for point of no return" , "One; A1" , "Top card or winning tennis serve" , "Crack" .)

I've seen this clue in The Times, The Mirror, The Telegraph, the King Feature Syndicate, The Sunday Times, the Universal, The Star Tribune, the Penny Press, The New York Times, the USA Today, the Evening Standard, The Guardian, the LA Times, The Wall Street Journal and The Sun.
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