Possible tear in part of the eye (6)
I believe the answer is:
retina
This could be a double definition.
'possible tear' is the first definition.
The definition and answer can be both body parts as well as being singular nouns.
Maybe there's a link between them I don't understand?
'part of the eye' is the second definition.
('retina' is part of 'eye')
'in' acts as a link.
Can you help me to learn more?
(Other definitions for retina that I've seen before include "Membrane that can become detached" , "Light-sensitive eye lining" , "Membrane in eye, sensitive to light" , "Retain with part of eye" , "It helps one to see" .)