Team with bias (4)
I believe the answer is:
side
This clue is a double definition.
'team' is the first definition.
(both can mean a sports team)
'bias' is the second definition.
(as in being one-sided)
'with' is the link.
(Other definitions for side that I've seen before include "Affectation" , "group of players" , "Team - pretentious manner" , "Face - team" , "Wolves, say" .)