Damned instigator of riot has charged around (8)
I believe the answer is:
accursed
'damned' is the definition.
(I've seen this before)
'instigator of riot has charged around' is the wordplay.
'instigator of riot has' becomes 'r' (I can't explain this - if you can you should believe this answer much more).
'charged' becomes 'accused' ('accuse' can be a synonym of 'charge').
'around' is an insertion indicator.
'r' put inside 'accused' is 'ACCURSED'.
(Other definitions for accursed that I've seen before include "Hateful" , "Detestable (colloq.)" , "Wretched" , "Cue cards (anag) - doomed" , "Damned" .)