Good at sports (8)
I believe the answer is:
athletic
'good at sports' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for athletic that I've seen before include "Vigorously active" , "Given to partaking in sporting events" , "With a strong and well proportioned body" , "Wigan, for example" , "Fit and sporty" .)