Not allowed to fly (8)
I believe the answer is:
grounded
'not allowed to fly' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for grounded that I've seen before include "Prevented from flying" , "Not allowed to fly" , "Based; forbidden to fly" , "Punished teenager by confining to house - poor underdog" , "Earthed" .)