Team companion? (4)
I believe the answer is:
mate
This clue is a double definition.
'team' is the first definition.
(thesaurus)
'companion?' is the second definition.
(both can mean a friend)
(Other definitions for mate that I've seen before include "Officer below master on a commercial ship" , "Spouse or informal pal (4)" , "Team (anag.)" , "Friend; ship's officer" , "Marry - friend" .)