He utilizes some of the house rightly (4)
I believe the answer is:
user
'he utilizes some' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'of the house rightly' is the wordplay.
'of' says the answer is hidden in the clue.
'USER' can be found hidden inside 'the house rightly'.
Can you help me to learn more?
(Other definitions for user that I've seen before include "Ruse for employer" , "One who exploits, to be sure" , "Right long-established" , "Patron" , "Utiliser" .)