Aircraft at the end of the flight in the sky (6)
I believe the answer is:
planet
'flight in the sky' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'aircraft at the end of' is the wordplay.
'aircraft' becomes 'plane' (plane is a kind of aircraft).
'the end of' suggests the final letters.
The last letter of 'at' is 't'.
'plane'+'t'='PLANET'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for planet that I've seen before include "Large celestial body" , "Sun's orbiter" , "Earth perhaps" , "Celestial body orbiting round a star" , "massive revolver" .)