Ancient doer of wrong in alliance (13)
I believe the answer is:
confederation
'alliance' is the definition.
(I have seen 'Alliance of states ' mean 'confederation' so perhaps 'alliance' could also mean 'confederation')
'ancient doer of wrong' is the wordplay.
'wrong' indicates anagramming the letters.
'ancient'+'doer'+'of'='ancientdoerof'
'ancientdoerof' is an anagram of 'CONFEDERATION'.
'in' acts as a link.
(Other definitions for confederation that I've seen before include "Union (of states)" , "Alliance of several parties" , "Loose alliance of political units" , "Alliance of states" , "League of states" .)