A-team notwithstanding (5)
I believe the answer is:
aside
'notwithstanding' is the definition.
('aside' can mean 'notwithstanding' or 'apart')
'a-team' is the wordplay.
'team' becomes 'side' (both can mean a sports team).
'a'+'side'='ASIDE'
(Other definitions for aside that I've seen before include "(Pushed) out of the way" , "Actor's covert line" , "Ideas (anag)" , "Whispered comment" , "secretly" .)