Producer of thick spray that reduces visibility (8)
I believe the answer is:
cataract
This could be a double definition.
'producer of thick spray that reduces' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'visibility' is the second definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Maybe you can see a link between them that I can't see?
Can you help me to learn more?
(Other definitions for cataract that I've seen before include "A real downpour" , "that impairs vision" , "that may cause blindness" , "Waterfall - eye complaint" , "Force" .)