Revolution dismissed in assembly (7)
I believe the answer is:
turnout
'assembly' is the definition.
(thesaurus)
'revolution dismissed' is the wordplay.
'revolution' becomes 'turn' (I've seen this before**).
'dismissed' becomes 'out' (I've seen this before).
'turn'+'out'='TURNOUT'
'in' is the link.
(Other definitions for turnout that I've seen before include "Attendance figure" , "The number of people who came to a function" , "Eventuate; dismiss" , "Evict" , "Number voting" .)