Aviate without an engine (5)
I believe the answer is:
glide
'aviate without an engine' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for glide that I've seen before include "Skate" , "Make an unpowered flight" , "Move smoothly along a surface" , "Run smoothly" , "Move smoothly, as a sailplane" .)