Having shown surpassing skill, picked for one's country (6)
I believe the answer is:
capped
'picked for one's country' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for capped that I've seen before include "Of teeth fitted with crowns" , "Imposed limits - or headgear?" , "Covered on top" , "Imposed limit upon - or selected to play for country in rugby?" , "Limited" .)