Boycott dirty sort of pillage (8)
I believe the answer is:
banditry
'pillage' is the definition.
(banditry is a kind of pillage)
'boycott dirty sort' is the wordplay.
'boycott' becomes 'ban'.
'sort' is an anagram indicator.
'dirty' with letters rearranged gives 'ditry'.
'ban'+'ditry'='BANDITRY'
'of' is the link.
(Other definitions for banditry that I've seen before include "Activity of lawless robbers" , "Criminal behaviour" , "Activity of armed robbers" , "Plundering in gangs" , "Brigandage" .)