Neighbours in the air on the first transport overseas (4)
I believe the answer is:
raft
'transport overseas' is the definition.
'raft' can be an answer for 'transport' (rafting is a kind of transporting). I'm not sure about the 'overseas' bit.
'neighbours in the air on the first' is the wordplay.
'neighbours in the air' becomes 'raf' (I can't explain this - if you can you should give a lot more credence to this answer).
'on' is a charade indicator (letters next to each other).
'first' says to take the initial letters.
The first letter of 'the' is 't'.
'raf'+'t'='RAFT'
Can you help me to learn more?
(Other definitions for raft that I've seen before include "Simple floating structure" , "vessel" , "Buoyant platform" , "Flat buoyant structure used as a boat" , "Travel on river, in a way" .)