Wild fancy (7)
I believe the answer is:
chimera
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wild fancy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for chimera that I've seen before include "fantasy" , "In Greek myth, a monster-mix of lion, goat and serpent" , "Wild or impossible idea" , "Each rim (anag) - foolish fancy" , "A wild fancy" .)