He may have fled corrupt regime? (6)
I believe the answer is:
emigre
'he may have fled' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'corrupt regime?' is the wordplay.
'corrupt' is an anagram indicator (a corrupted form).
'regime' with letters rearranged gives 'EMIGRE'.
Can you help me to learn more?
(Other definitions for emigre that I've seen before include "person coming from Russia without love, perhaps" , "One gone abroad for political reasons" , "One who's fled abroad" , "One living abroad (to escape regime)" , "Person settling in another country" .)