Stay on team (6)
I believe the answer is:
reside
'stay' is the definition.
(I've seen this in another clue)
'on team' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'team' becomes 'side' (both can mean a sports team).
're'+'side'='RESIDE'
(Other definitions for reside that I've seen before include "'Live, dwell (6)'" , "Dwell, be present (in)" , "Dwell in desire" , "Make one's home permanently" , "Live in permanently" .)