Aircraft at the end of a flight in the sky (6)
I believe the answer is:
planet
'the sky' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'aircraft at the end of a flight' is the wordplay.
'aircraft' becomes 'plane' (plane is a kind of aircraft).
'at the end of' suggests the final letters.
The final letter of 'flight' is 't'.
'plane'+'t'='PLANET'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for planet that I've seen before include "Celestial body that revolves around the sun" , "Sun's orbiter" , "Large satellite of star" , "Heavenly body moving round the sun" , "Heavenly (or earthly!) body" .)