Sediment area around house (7)
I believe the answer is:
grounds
I believe this is a double definition.
'sediment' is the first definition.
(as in coffee grounds)
'area around house' is the second definition.
(the grounds of a building or estate)
(Other definitions for grounds that I've seen before include "justification" , "Area of enclosed land around a building" , "Reasons" , "Basis for belief" , "Refuses authority to fly" .)