Half of the record team (4)
I believe the answer is:
side
'team' is the definition.
(both can mean a sports team)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for side that I've seen before include "TV channel" , "pretentious attitude" , "group of players" , "Affectation" , "Left or right, say" .)