Coach in utter defeat returning embracing team's leader (5)
I believe the answer is:
tutor
'coach' is the definition.
(I know that coach can be written as tutor)
'utter defeat returning embracing team's leader' is the wordplay.
'utter defeat' becomes 'rout' (I've seen this before).
'returning' says the letters should be written backwards.
'embracing' means one lot of letters goes inside another.
'leader' says to take the initial letters.
The first letter of 'teams' is 't'.
'rout' reversed gives 'tuor'.
'tuor' going around 't' is 'TUTOR'.
'in' is the link.
(Other definitions for tutor that I've seen before include "train" , "Private educator" , "Edify" , "Teach" , "Trout (anag)" .)