Appeased Unionist leaves assembly in rush (10)
I believe the answer is:
reconciled
This might be a double definition.
'appeased unionist' is the first definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Perhaps there's a link between them I don't understand?
'assembly in rush' is the second definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?
'leaves' acts as a link.
Can you help me to learn more?
(Another definition for reconciled that I've seen is " Friendly again after a quarrel".)