Mythological monster (7)
I believe the answer is:
chimera
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mythological monster</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 chimera that I've seen before include "Creature such as a gryphon" , "figment of the imagination" , "eaders of radio appear after jingle" , "A wild fancy" , "Mythical monster, part lion, goat and serpent" .)