Shockingly evil (7)
I believe the answer is:
heinous
'shockingly evil' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for heinous that I've seen before include "Extremely wicked" , "Extremely evil" , "Very wicked, maybe in-house" , "Shocking (offence)" , "Shockingly wicked" .)