Crossword Genius

For a professional (3)

Ross

I believe the answer is:

pro

This clue is a double definition.

'for' is the first definition.
(as in being 'pro' something)

'a professional' is the second definition.
(abbreviation)

(Other definitions for pro that I've seen before include "Expert (abbr)" , "Favouring the professional" , "Golfer" , "For; non-amateur" , "Professional; advantage" .)

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