Team resigned, being involved in a row (12)
I believe the answer is:
disagreement
'a row' is the definition.
(a row is an argument or disagreement)
'team resigned being involved' is the wordplay.
'being involved' indicates an anagram (involved can mean confusing or complex).
'team'+'resigned'='teamresigned'
'teamresigned' with letters rearranged gives 'DISAGREEMENT'.
'in' acts as a link.
(Other definitions for disagreement that I've seen before include "Argument" , "Conflict" , "Quarrel" , "Difference of opinion" , "Contretemps" .)