A team dies out (4)
I believe the answer is:
side
'a team' is the definition.
(both can mean a sports team)
'dies out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'dies' anagrammed gives 'SIDE'.
(Other definitions for side that I've seen before include "Affectation" , "Dies (anag)" , "Bank" , "TV channel" , "Neighbourhood" .)