Crossword Genius

In favour of person getting paid (3)

Ross

I believe the answer is:

pro

I believe this is a double definition.

'in favour of' is the first definition.
(being pro a particular cause)

'person getting paid' is the second definition.
(paid professional)

(Other definitions for pro that I've seen before include "Paid worker" , "With qualifications" , "Preposition meaning for, in favour of" , "Of argument, say, in favour of" , "Favouring the professional" .)

I've seen this clue in The Times.
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