Rogue at home behind house (7)
I believe the answer is:
villain
'rogue' is the definition.
(both can mean a dishonourable person)
'home behind house' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'behind' says to put 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 "One played badly" , "Principal wicked character" , "Principal fictional baddie" , "Evil-doer" , "Wicked criminal" .)