Crossword Genius

Prove unfaithful, as golfers typically do (4,6)

Ross

I believe the answer is:

play around

'prove unfaithful' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

(Another definition for play around that I've seen is " flirt with the ladies?".)

I've seen this clue in The Times.
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