He cares for others (7)
I believe the answer is:
trustee
'he cares for others' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for trustee that I've seen before include "One with powers of administration over property" , "Member of a fund's governing board" , "Person with legal ownership of property to be used solely for specified purposes" , "financial overseer" , "Runner of charity" .)