Take to the sky (3)
(Other definitions for fly that I've seen before include "needs to get away" , "Move through air" , "Glide" , "SECOND PART OF 14" , "Move quickly; knowing" .)
'take to the sky' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aviate that I've seen before include "Pilot a plane" , "Ride the Zephyr, say" , "Fly" , "Handle jumbo, maybe" .)