He won't buy the same article twice (6)
I believe the answer is:
editor
'article twice' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'he won't buy the same' is the wordplay.
I cannot quite see how this works, but
'he' could be 'ed' (short for Edward) and 'ed' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for editor that I've seen before include "One who determines the final content of a text" , "Newspaper or publication chief" , "Publishing head" , "Newspaper boss" , "Script-preparer" .)