A detailed quotation can make it clear (7)
I believe the answer is:
recital
'a detailed quotation' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'make it clear' is the wordplay.
'make' is an anagram indicator.
'it'+'clear'='itclear'
'itclear' with letters rearranged gives 'RECITAL'.
'can' acts as a link.
Can you help me to learn more?
(Other definitions for recital that I've seen before include "Verbal account" , "Enumeration of facts" , "Narration" , "Telling" , "(Usually solo) concert" .)