Satan in shape (4)
I believe the answer is:
nick
'satan in shape' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe you can see an association between them that I don't see?
This is the entire clue.
Can you help me to learn more?
(Other definitions for nick that I've seen before include "Steal (slang)" , "Small cut - if old, the devil" , "where thieves are" , "Small cut or notch" , "Arrest - purloin" .)