On paper, a good time on the Fourth of July (6)
I believe the answer is:
treaty
'on paper' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'a good time on the fourth of july' is the wordplay.
'a good time' becomes 'tre' (I can't justify this - if you can you should believe this answer much more).
'on' becomes 'at' (I've seen this in other clues).
'the fourth of july' becomes 'y' (fourth letter of the word 'July').
'tre'+'at'+'y'='TREATY'
Can you help me to learn more?
(Other definitions for treaty that I've seen before include "Contract, agreement" , "Political or private agreement" , "Contract between states" , "Yatter (anag.)" , "convention?" .)