Flight landing in the middle of widest air strip (6)
I believe the answer is:
stairs
'flight' is the definition.
(I've seen this before)
'in the middle of widest air strip' is the wordplay.
'in the middle of' indicates a hidden word.
'STAIRS' is hidden in the letters of 'widest air strip'.
'landing' acts as a link.
(Other definitions for stairs that I've seen before include "Interior means of ascent" , "A set of rising steps" , "Flights of steps" , "A flight of indoor steps" , "Series of steps" .)