Crossword Genius

Fun with a "mate" (5)

Ross

I believe the answer is:

sport

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'fun' is the definition.
(I know that fun can be written as sport)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sport that I've seen before include "Exhibit publicly; eg soccer" , "Eg, football; fun" , "Recreation, play" , "Physical recreation" , "Wear, display (an item)" .)

I've seen this clue in the Evening Standard.
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