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