Joined the team (6)
I believe the answer is:
united
I believe this is a double definition.
'joined' is the first definition.
(I know that joined can be written as united)
'team' is the second definition.
(eg Manchester United football club)
'the' is the link.
(Other definitions for united that I've seen before include "Joined together like Manchester soccer team" , "Joined into a single entity" , "See 10" , "See 14" , "cooperative" .)