Undoing northeastern disorder inspires India (7)
I believe the answer is:
nemesis
'undoing' is the definition.
(nemesis can mean someone's doom or undoing)
'northeastern disorder inspires india' is the wordplay.
'northeastern' becomes 'ne' (abbreviation for northeastern).
'disorder' becomes 'mess' (messing is a kind of disordering).
'inspires' is an insertion indicator (inspire means to breathe in).
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'mess' placed around 'i' is 'mesis'.
'ne'+'mesis'='NEMESIS'
(Other definitions for nemesis that I've seen before include "Destiny" , "Figure of retribution" , "Goddess of retribution in Greek mythology" , "Bane" , "enemy" .)