Change ends, sportingly (3)
I believe the answer is:
run
'change' is the definition.
(run is a kind of change)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for run that I've seen before include "Flow; smuggle (goods)" , "Control" , "trip" , "Jog; manage" , "Dash" .)