Therefore, one in airport has found way out (8)
I believe the answer is:
solution
'way out' is the definition.
(way out of a problem)
'therefore one in airport' is the wordplay.
'therefore' becomes 'so' ('so' can mean 'consequently' or 'therefore').
'one' becomes 'i' (Roman numeral).
'in' indicates putting letters inside.
'airport' becomes 'luton' (London Luton Airport).
'i' put inside 'luton' is 'lution'.
'so'+'lution'='SOLUTION'
'has found' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for solution that I've seen before include "13 across" , "Holmes often sought?" , "something involving less concentration" , "A mixture of liquids" , "Drink" .)