Border team (4)
I believe the answer is:
side
This clue is a double definition.
'border' is the first definition.
(I've seen this in other clues)
'team' is the second definition.
(both can mean a sports team)
(Other definitions for side that I've seen before include "Aspect, sports team" , "Airs, conceit" , "Spin given to a ball by striking it off-centre" , "pretentious attitude" , "Airs and graces" .)