Bullfighter split and heads rolled (6)
I believe the answer is:
torero
'bullfighter' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for torero that I've seen before include "Escamillo, for example" , "Spaniard in ring" , "Bullring occupant" , "Blood-sport participant" , "Bullfighter" .)