Take-off strip (6)
I believe the answer is:
runway
'take-off strip' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for runway that I've seen before include "Take-off tarmac" , "Strip for take off and landing of aircraft" , "Unwary (anag)" , "A plane takes off from it" , "Airstrip" .)