Aim of literature? (6)
I believe the answer is:
reader
'aim of literature?' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
This is all the clue.
Can you help me to learn more?
(Other definitions for reader that I've seen before include "Interpreter of what is written" , "(User of) standard textbook" , "He's immersed in a book or newspaper" , "Times subscriber, perhaps?" , "Reared by book lover" .)