Last English team involved in deadlock (9)
I believe the answer is:
stalemate
'deadlock' is the definition.
(synonyms)
'last english team involved' is the wordplay.
'english' becomes 'E' (abbreviation).
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'last'+'e'+'team'='lasteteam'
'lasteteam' is an anagram of 'STALEMATE'.
'in' is the link.
(Other definitions for stalemate that I've seen before include "situation without a winner" , "Deadlock, impasse" , "Deadlocked position" , "Situation offering no way forward" , "Possible chess game ending" .)