Flying (8)
'flying' is the definition.
(I know that flying can be written as aviation)
This is all the clue.
(Other definitions for aviation that I've seen before include "The business of airlines" , "The aircraft industry" , "Mechanical flight" , "The business of flying aircraft" , "Job; date" .)
'flying' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for airborne that I've seen before include "Having taken off" , "in the sky" , "so, paras?" , "Aloft, flying" , "Off the ground" .)
(Other definitions for saucer that I've seen before include "Item of crockery" , "flying, perhaps?" , "If flying, it would have alien pilots" , "Shallow dish, flying?" , "Piece of crockery, mysterious when flying" .)
'flying' is the definition.
(I know that solo is a type of flying)
This is all the clue.
(Other definitions for solo that I've seen before include "Han - (Star Wars); fly unaccompanied" , "By oneself" , "Game for four" , "Unaccompanied - card game" , "Type of whist" .)