Put an end to dubious practices in sport (6,7)
I believe the answer is:
squash rackets
'sport' is the definition.
(squash rackets is a kind of sport)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for squash rackets that I've seen before include "sport" , "Game" , "they'll be needed in court" , "Court action" , "put an end to fraudulent schemes" .)