Crossword Genius

Play fringe - it's where the profit is (6)

Ross

I believe the answer is:

margin

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'play' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for margin that I've seen before include "Boundary line or the area" , "bank" , "Permissible difference" , "Blank space around the edge" , "Edge; room for error" .)

I've seen this clue in The Irish Times.
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