"The Scourge of God" (6)
I believe the answer is:
attila
'the scourge of god' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for attila that I've seen before include "The most famous Hun" , "He attacked the Romans" , "Devastating ruler" , "The Scourge of God" , "Fifth century Hunnish leader" .)