Busy wearing a ring? (7)
I believe the answer is:
engaged
I believe this clue is a double definition.
'busy' is the first definition.
('engaged' can be similar in meaning to 'busy')
'wearing a ring?' is the second definition.
(Other definitions for engaged that I've seen before include "Promised in marriage" , "In use" , "being committed to union" , "Hired; busy" , "Betrothed - busy" .)