Government failed émigré (6)
I believe the answer is:
regime
'government' is the definition.
(I know that government can be written as regime)
'failed emigre' is the wordplay.
'failed' indicates an anagram.
'emigre' with letters rearranged gives 'REGIME'.
(Other definitions for regime that I've seen before include "Government; ordered way of doing something" , "Authoritarian system" , "Command" , "Emigre (anag.)" , "Government, especially an authoritarian one" .)