Membrane sensitive to light: moving near it (6)
I believe the answer is:
retina
'membrane' is the definition.
(I know that retina is a type of membrane)
'moving near it' is the wordplay.
'moving' indicates an anagram (letters are moved around).
'near'+'it'='nearit'
'nearit' is an anagram of 'RETINA'.
'sensitive to light' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for retina that I've seen before include "Back surface of eye" , "Light-sensitive eye layer" , "Membrane covering the back of the eyeball" , "It helps one to see" , "Light-sensitive membrane of the eyeball" .)