Lives concerned with teams (7)
I believe the answer is:
resides
'lives' is the definition.
(to reside somewhere is to live there)
'concerned with teams' is the wordplay.
'concerned with' becomes 're' (re can mean regarding, concerning).
'teams' becomes 'sides' (eg football sides).
're'+'sides'='RESIDES'
(Other definitions for resides that I've seen before include "stays required" , "stayed in Scotland" , "Lives, dwells" , "stays in Peebles" , "Sojourns" .)