Crossword Genius

One in the big leagues (3)

Ross

I believe the answer is:

pro

'one in the big leagues' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for pro that I've seen before include "Top player" , "Skilled" , "Paid worker" , "For; non-amateur" , "Of argument, say, in favour of" .)

I've seen this clue in the Universal.
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