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By it one develops feeling for character (7)

Ross

I believe the answer is:

braille

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'character' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

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(Other definitions for braille that I've seen before include "Touching letters" , "French educationist" , "System of writing for the visually-impaired" , "Language using touch" , "Liberal language for blind people" .)

I've seen this clue in The Telegraph, The Times, The Independent and The Sun.
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