Landing strip harbours a fugitive (7)
I believe the answer is:
runaway
'fugitive' is the definition.
(I know that fugitive can be written as runaway)
'landing strip harbours a' is the wordplay.
'landing strip' becomes 'runway' (I've seen this in another clue).
'harbours' indicates putting letters inside.
'runway' enclosing 'a' is 'RUNAWAY'.
(Other definitions for runaway that I've seen before include "refugee?" , "Fugitive" , "scooter?" , "Absconder" , "One who flies" .)