Conspirator in the Gunpowder Plot of 1605 (6)
I believe the answer is:
fawkes
(Other definitions for fawkes that I've seen before include "Gunpowder plotter" , "Guy -- (November 5)" , "Guy . . . . . . burned in effigy on Nov 5th" , "Guy -- (Gunpowder Plot)" , "Guy --, conspirator" .)