Part of dissident team (4)
I believe the answer is:
side
'team' is the definition.
(both can mean a sports team)
'part of dissident' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'SIDE' is hidden in the letters of 'dissident'.
(Other definitions for side that I've seen before include "Lateral team" , "group of players" , "part" , "Team; boastful manner" , "Pretentious air" .)