Mythical man-bull (8)
I believe the answer is:
minotaur
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mythical man-bull</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for minotaur that I've seen before include "Bull-headed type" , "Labyrinth monster killed by Theseus" , "awful beast" , "Mythological man-bull" , "Mythical creature" .)