Run off to get sprinter? (4)
I believe the answer is:
bolt
I believe this clue is a double definition.
'run off' is the first definition.
(I know that run off can be written as bolt)
'sprinter?' is the second definition.
(runner Usain Bolt)
'to get' acts as a link.
(Other definitions for bolt that I've seen before include "Find a bar" , "Short arrow for a crossbow" , "Run away; fasten (door)" , "Eat hurriedly" , "Lock - run away - gobble - lightning flash - cloth roll" .)