He goes riding after the ball (4,6)

I believe the answer is:

polo player

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'he' is the definition.
I know nothing about this answer so I can't judge whether this works.

'goes riding after the ball' is the wordplay.
'goes riding' becomes 'player' (I can't explain this - if you can you should believe this answer much more).
'after' means one lot of letters go next to another.
'the ball' becomes 'polo' (polo ball is a kind of ball).
'player' put after 'polo' is 'POLO PLAYER'.

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I've seen this clue in The Globe and Mail and The Guardian.

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