Wickedness not recorded after revolution (4)
I believe the answer is:
evil
'wickedness' is the definition.
('evil' can be a synonym of 'wickedness')
'not recorded after revolution' is the wordplay.
'not recorded' becomes 'live' ('live' is the opposite to 'recorded').
'after revolution' says the letters should be written in reverse.
'live' reversed gives 'EVIL'.
(Other definitions for evil that I've seen before include "Badness, depravity" , "Nefarious" , "Extremely bad" , "Depravity, wickedness" , "no good in this puzzle" .)