It can be bad for the elbow, sport (6)

I believe the answer is:

tennis

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'sport' is the definition.
(tennis is a sport)

I can't explain the remainder of the clue.

(Other definitions for tennis that I've seen before include "court contest" , "Henman's game" , "Racket sport" , "Racquet-game" , "Sport with grand slams?" .)

I've seen this clue in the Evening Standard.

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