Historic air liner still possibly seen in the sky (5)
I believe the answer is:
comet
'the sky' is the definition.
The definition and answer can be both natural objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'historic air liner still possibly seen' is the wordplay.
I cannot really see how this works, but
'seen' could be 'met' ('meet' can be a synonym of 'see') and 'met' is found in the answer.
The remaining letters 'co' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for comet that I've seen before include "Long distance traveller" , "Celestial body - early jet aircraft" , "Rudolph's companion" , "potential space invader" , "body found in space" .)