Rings groups (5)
I believe the answer is:
bands
I believe this clue is a double definition.
'rings' is the first definition.
('band' can be a synonym of 'ring')
'groups' is the second definition.
The answer is an example.
(Other definitions for bands that I've seen before include "Groups playing popular music" , "Gangs" , "Pop groups" , "Musical groups" .)