Finally doesn’t finish tome (5)
I believe the answer is:
atlas
'tome' 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?
'finally doesn't finish' is the wordplay.
'finally' becomes 'at last' (synonyms).
'doesn't finish' means to remove the last letter.
'atlast' with its last letter taken off is 'ATLAS'.
Can you help me to learn more?
(Other definitions for atlas that I've seen before include "Its architectural name is telamon" , "Segment of spine" , "book of world records?" , "travel book" , "Map collection" .)