Model, for example? (7)
I believe the answer is:
synonym
'model for example?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?
This is the entire clue.
Can you help me to learn more?
(Other definitions for synonym that I've seen before include "Word that can replace another in context" , "My sonny (anag)" , "Word that can be exchanged for another" , "Alternative word" , "Substitute brought in for a term" .)