End of flight, outdoors and in (7)
I believe the answer is:
landing
'end of flight' is the definition.
(eg a plane landing)
'outdoors and in' is the wordplay.
'outdoors' becomes 'ling' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'ling' placed around 'and' is 'LANDING'.
(Other definitions for landing that I've seen before include "Coming down to earth" , "Intermediate platform in a staircase" , "Touching down" , "Level area between stair flights" , "Level space near staircase" .)