The type to feel for the blind (7)
I believe the answer is:
braille
'blind' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I can't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for braille that I've seen before include "type of relief" , "Language using touch" , "French educationist" , "Raised type for blind people" , "System of writing for sightless people" .)