A scholarly document points this out (6)
I believe the answer is:
thesis
'a scholarly document' is the definition.
The definition and answer 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?
'points this out' is the wordplay.
'points' becomes 'es' (E is an example).
'out' is an insertion indicator.
'es' put inside 'this' is 'THESIS'.
Can you help me to learn more?
(Other definitions for thesis that I've seen before include "Treatise advancing a new point of view resulting from research" , "research paper" , "Dissertation - idea" , "A lengthy essay, perhaps for degree" , "Dissertation presented for a doctorate" .)