Criminal at home behind house (7)
I believe the answer is:
villain
'criminal' is the definition.
(both can mean a bad person)
'home behind house' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'behind' is a charade indicator (letters next to each other).
'house' becomes 'villa' (villa is a kind of house).
'in' put after 'villa' is 'VILLAIN'.
'at' is the link.
(Other definitions for villain that I've seen before include "Criminal; stage baddy" , "Criminal, rogue" , "He may rob you" , "Bad guy" , "Principal wicked character" .)