Wickedness that gets a grip (4)
I believe the answer is:
vice
I believe this is a double definition.
'wickedness' is the first definition.
(I've seen this before)
'a grip' is the second definition.
(I've seen this before)
'that gets' is the link.
(Other definitions for vice that I've seen before include "As a substitute for; immoral behaviour" , "item in workshop" , "Prefix for deputy to, say, chairman" , "Sin; weakness" , "Fault - gripping tool" .)