Picked up famous dog’s rubber ring (7)
I believe the answer is:
grommet
'ring' is the definition.
(protective ring used in electronics)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for grommet that I've seen before include "Protective eyelet" , "Eyelet in a sheet or panel" , "Ring for hole - tube for eardrum" , "Ring shaped to line a small hole" , "Tube in eardrum to drain and ventilate ear" .)