Marathon or sprint (4)
I believe the answer is:
race
I believe this is a double definition.
'marathon' is the first definition.
(I've seen this in another clue)
'sprint' is the second definition.
(I've seen this in another clue)
(Other definitions for race that I've seen before include "Care about contest" , "compete to come first" , "Rush" , "Contest; zoom" , "Speed competition" .)