Old magistrate in care eventually (5)
I believe the answer is:
reeve
'old magistrate' is the definition.
(historical type of magistrate or judge)
'in care eventually' is the wordplay.
'in' indicates a hidden word.
'REEVE' is hidden in the letters of 'care eventually'.
(Other definitions for reeve that I've seen before include "High official" , "One of Chaucer's tale-tellers" , "Female ruff; also a bailiff" , "thread his way through" , "Former magistrate" .)