House thief (7)
I believe the answer is:
burglar
'house thief' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for burglar that I've seen before include "Intruder with intent to steal" , "House robber" , "Housebreaker" , "Breaker and enterer?" , "Thief who enters a building to steal" .)