Biden rendered powerless finds house physician? (8)
I believe the answer is:
resident
'house physician?' is the definition.
('resident' can be a synonym of 'house physician')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for resident that I've seen before include "One living in the place referred to" , "One living somewhere" , "Permanent dweller" , "Someone with a home" , "Incumbent" .)