In residential care? (4)
I believe the answer is:
home
This might be a double definition.
'in' is the first definition.
('he's in' can mean 'he's home')
'residential care?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
Can you help me to learn more?
(Other definitions for home that I've seen before include "dwelling house" , "Last line of defence in World War II" , "Be it ever so humble, there's no place like it" , "Not away" , "Domicile" .)