Jet’s surface (5)
I believe the answer is:
plane
I believe this clue is a double definition.
'jet's' is the first definition.
(I've seen this in another clue)
'surface' is the second definition.
(I've seen this before)
(Other definitions for plane that I've seen before include "Form of transport" , "Aircraft - level surface - carpenter's tool" , "Nepal (anag.)" , "Flat surface; tree" , "This flier" .)