A ring of care, naturally (5)
I believe the answer is:
arena
'a ring' is the definition.
(ring is a kind of arena or venue)
'of care naturally' is the wordplay.
'of' says the answer is hidden in the clue.
'ARENA' is hidden within 'care naturally'.
(Other definitions for arena that I've seen before include "where there's competition" , "Place of great activity" , "Performance venue" , "Scene of combat" , "Gladiatorial venue" .)