Almost the end of a union dispute? (6,4)
I believe the answer is:
decree nisi
'dispute?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for decree nisi that I've seen before include "Provisional divorce order" , "Judicial order" , "Provisional divorce document" , "court order" , "Separation agreement" .)