Crossword Genius

Expert (4,6)

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 Mirror, The Times, the King Feature Syndicate, The Star Tribune, The Wall Street Journal, the Evening Standard, the Universal, The New York Times, the Penny Press, The Telegraph, the LA Times, The Sun and the USA Today.
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