House fashionable for a criminal (7)
I believe the answer is:
villain
'for a criminal' is the definition.
(both can mean a bad person)
'house fashionable' is the wordplay.
'house' becomes 'villa' (villa is a kind of house).
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'villa'+'in'='VILLAIN'
(Other definitions for villain that I've seen before include "Scoundrel" , "Bad guy" , "Wrongdoer" , "Criminal; stage baddy" , "Bad person in story/play" .)