Record token (4)
I believe the answer is:
note
This clue could be a double definition.
'record' is the first definition.
(note can mean to record or notate)
'token' is the second definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for note that I've seen before include "Short communication" , "Tone of brief written record" , "Record; memo" , "Short written message" , "Do, re or mi?" .)