Bill amount demanded, getting positive response (7)
I believe the answer is:
acclaim
'positive response' 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 don't see?
'bill amount demanded getting' is the wordplay.
'bill' becomes 'acc'.
'amount' becomes 'l' (l is a kind of amount).
'demanded getting' becomes 'aim' (I can't justify this - if you can you should give a lot more credence to this answer).
'acc'+'l'+'aim'='ACCLAIM'
Can you help me to learn more?
(Other definitions for acclaim that I've seen before include "Welcome enthusiastically" , "Plaudits" , "Credit" , "Hail" , "Enthusiastic approval" .)