Come together with capacity to contain revolutionary chaos (8)
I believe the answer is:
assemble
'come together' is the definition.
(thesaurus)
'with capacity to contain revolutionary chaos' is the wordplay.
'with capacity' becomes 'able'.
'to contain' means one lot of letters goes inside another.
'revolutionary' is a reversal indicator.
'chaos' becomes 'mess' (I've seen this before).
'mess' reversed gives 'ssem'.
'able' enclosing 'ssem' is 'ASSEMBLE'.
(Other definitions for assemble that I've seen before include "Gather together at meeting place" , "Gather together in one place" , "Gather or collect together" , "Bring or gather together" , "Meet" .)