Unruly trios creating disturbances (5)
I believe the answer is:
riots
'disturbances' is the definition.
(I have seen 'Public disturbances' mean 'riots' so perhaps 'disturbances' could also mean 'riots')
'unruly trios' is the wordplay.
'unruly' indicates an anagram.
'trios' with letters rearranged gives 'RIOTS'.
'creating' acts as a link.
(Other definitions for riots that I've seen before include "Violent disturbances" , "Public disturbances" , "Protests" , "Wild disturbances by crowds" , "Acts of violence by unruly mobs" .)