Decapitated (8)
I believe the answer is:
beheaded
'decapitated' is the definition.
('behead' can be a synonym of 'decapitate')
This is all the clue.
(Other definitions for beheaded that I've seen before include "Queen Jane was" , "As were two wives of Henry VIII" , "Guillotined" , "Decapitated" , "Topped" .)