Airstrip harbouring a fugitive (7)
I believe the answer is:
runaway
'fugitive' is the definition.
(I know that fugitive can be written as runaway)
'airstrip harbouring a' is the wordplay.
'airstrip' becomes 'runway' (I've seen this before).
'harbouring' is an insertion indicator.
'runway' going around 'a' is 'RUNAWAY'.
(Other definitions for runaway that I've seen before include "scooter?" , "Absconder" , "Fugitive" , "refugee?" , "Del Shannon hit" .)