Crossword Genius

Disorderly trio cause outbreak of lawlessness (4)

Ross

I believe the answer is:

riot

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Irish Independent.
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