Hate stealing or wicked crime (8)
I believe the answer is:
enormity
'wicked crime' is the definition.
(enormity can mean something evil)
'hate stealing or' is the wordplay.
'hate' becomes 'enmity' (enmity is a kind of hate).
'stealing' means one lot of letters goes inside another.
'enmity' placed around 'or' is 'ENORMITY'.
(Other definitions for enormity that I've seen before include "Outrage" , "Grave crime or sin" , "act of wickedness?" , "horror" , "Atrociousness" .)