Disorderly trio cause outbreak of lawlessness (4)
I believe the answer is:
riot
'lawlessness' is the definition.
(thesaurus)
'disorderly trio cause outbreak' is the wordplay.
'trio' can be anagrammed to 'RIOT'.
However, I am not clear how this is indicated.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for riot that I've seen before include "Wild disturbance by crowd of people" , "Rowdy behaviour" , "Violent disturnance of the peace (by crowd)" , "Disturbance of the peace by many" , "Civil disorder" .)