Housebreaker (7)
I believe the answer is:
burglar
'housebreaker' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for burglar that I've seen before include "A criminal on one's premises" , "House-violating thief" , "One breaking in" , "Thieving intruder" , "Housebreaker" .)