They break up public meetings or rites perhaps (7)
I believe the answer is:
rioters
'they break up public meetings' is the definition.
The definition suggests an adverb but the answer is not.
'or rites perhaps' is the wordplay.
'perhaps' indicates an anagram.
'or'+'rites'='orrites'
'orrites' is an anagram of 'RIOTERS'.
Can you help me to learn more?
(Other definitions for rioters that I've seen before include "Demonstrators" , "Rabble-rousers" , "Violent protesters" , "Violent troublemakers" , "They disturb the peace" .)