Bar's rubbish on Sunday (6)
I believe the answer is:
stripe
This clue could be a double definition.
'bar's' is the first definition.
(thesaurus)
'rubbish on sunday' is the second definition.
The answer and definition 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 stripe that I've seen before include "Band of colour, maybe of rank" , "Band of colour - 3 of rank" , "Piece of braid indicating military rank" , "Sign of a soldier's rank" , "bar" .)