Duty company recalled with dispersal of riot (6)
I believe the answer is:
octroi
'duty' is the definition.
(I know that octroi is a type of duty)
'company recalled with dispersal of riot' is the wordplay.
'company' becomes 'co' (abbreviation).
'recalled' is a reversal indicator (to recall can mean to bring something back).
'with' says to put letters next to each other.
'dispersal of' indicates anagramming the letters (letters dispersed elsewhere).
'co' in reverse letter order is 'oc'.
'riot' is an anagram of 'troi'.
'oc'+'troi'='OCTROI'
(Other definitions for octroi that I've seen before include "Duty on goods entering a town" , "Old tax" , "Toll" , "tax on goods" .)