Crossword Genius

In favour of parent ditching husband for impresario (8)

Ross

I believe the answer is:

promoter

'impresario' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for promoter that I've seen before include "Organiser eg of boxing" , "One who stages boxing matches etc" , "Organiser (of a sporting event)" , "Impresario" , "One putting on a sporting event" .)

I've seen this clue in The Guardian.
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