Unrighteousness (7)
I believe the answer is:
impiety
'unrighteousness' is the definition.
(I know that impiety is a type of unrighteousness)
This is all the clue.
(Other definitions for impiety that I've seen before include "Irreverence, profanity" , "Irreligion" , "Lack of reverence" , "godlessness" , "sacrilege" .)