One has to stand by Washington in restrained approach to the house (8)
I believe the answer is:
driveway
'approach to the house' is the definition.
(a driveway leads up to a house)
'one has to stand by washington in restrained' is the wordplay.
I cannot really see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'washington' could be 'wa' (two letter abbreviation for the state) and 'wa' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for driveway that I've seen before include "Path leading from house gate to garage" , "Approach to a large house" , "Private road leading to a house" , "Private path for car in front of house" , "Path from house to road" .)