Concerned one (5)
I believe the answer is:
carer
'concerned one' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for carer that I've seen before include "One who looks after sick or disabled person at home" , "One attending invalid" , "One looking after an invalid" , "Attendant in nursing home" , "One looking after sick" .)