Team returns eating live goat! (4)
I believe the answer is:
ibex
'goat' is the definition.
(ibex is a kind of goat)
'team returns eating live' is the wordplay.
'team' becomes 'xi' (eleven, a football team).
'returns' says the letters should be written backwards.
'eating' means one lot of letters goes inside another.
'live' becomes 'be' ('be' can be a synonym of 'live').
'xi' written backwards gives 'ix'.
'ix' placed around 'be' is 'IBEX'.
(Other definitions for ibex that I've seen before include "Large-horned mountain goat" , "one seldom puts a foot wrong" , "Come out of an egg" , "Mountain goat with long curved horns" , "Mountain goat with curving horns" .)