Crossword Genius

Down-sell for sport (4)

Ross

I believe the answer is:

golf

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'for sport' is the definition.
(golf is a kind of sport)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for golf that I've seen before include "Eighteen-hole game" , "Outdoor game" , "Something played" , "Game with tees" , "Leonhard -, Swiss mathematician/physicist" .)

I've seen this clue in the Sydney Morning Herald.
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