Athlete’s bean (6)
I believe the answer is:
runner
This clue is a double definition.
'athlete's' is the first definition.
(type of athlete)
'bean' is the second definition.
(runner bean is a kind of bean)
(Other definitions for runner that I've seen before include "Messenger; plant shoot" , "done by con man, perhaps" , "Green vegetable" , "Old policeman" , "Canvas shoe with a rubber sole" .)