High-flying songbird (7)
I believe the answer is:
skylark
'high-flying songbird' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for skylark that I've seen before include "Indulge in horseplay" , "Shelley's blithe Spirit" , "subject of 11 [ODE]" , "Common songbird" , "Flyer" .)