Wild fancy (7)
I believe the answer is:
chimera
'wild fancy' is the definition.
(I've seen this before)
This is the entire clue.
(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" .)