A broken romance? (6)
I believe the answer is:
serial
'a broken romance?' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for serial that I've seen before include "Set of TV shows" , "Continuous, perhaps like mulitple killer ( 6)" , "following a characteristic pattern" , "In regular succession without gaps" , "Consecutive, sequential" .)