Crossword Genius

Top-notch, informally (5)

Ross

I believe the answer is:

primo

(Other definitions for primo that I've seen before include "Right-hand part in piano duet" , "Duet's lead part (It. first)" , "... Levi (novelist)" , "Principal part of duet" , "top player" .)

I've seen this clue in The Washington Post.
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