Go to cover firebombing - maybe originally ascribed to far right characters (8)
I believe the answer is:
personae
'characters' is the definition.
('persona' can be a synonym of 'character')
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for personae that I've seen before include "Dramatis ..., characters in a play" , "See 1" , "Theatrical roles" .)