Mythical creature with the head and tail of a bull and the body of a man (8)
I believe the answer is:
minotaur
(Other definitions for minotaur that I've seen before include "Mythical beast of Crete" , "Creature, half-man and half-bull, slain by Theseus in the Cretan maze" , "Monster, half bull and half man, slain by Theseus in Cretan labyrinth" , "Mythological man-bull" , "Bull-headed Cretan monster" .)