Jet surface (5)
I believe the answer is:
plane
I believe this is a double definition.
'jet' 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 "Tool for smoothing wood" , "barked?" , "This flier" , "What imitates bird" , "Woodworker's tool" .)