Coat for Iris? (6)
I believe the answer is:
cornea
This clue might be a double definition.
'coat' is the first definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'iris?' is the second definition.
(thesaurus)
'for' is the link.
Can you help me to learn more?
(Other definitions for cornea that I've seen before include "Eyeball membrane" , "It covers the eye" , "Outer covering of the eye" , "Front covering of eye" , "Observer section?" .)