Transport black tool (3,5)
I believe the answer is:
jet plane
'transport' is the definition.
(jet plane is a kind of transport)
'black tool' is the wordplay.
'black' becomes 'jet' (jet black is a kind of black).
'tool' becomes 'plane' (plane is a kind of tool).
'jet'+'plane'='JET PLANE'
(Other definitions for jet plane that I've seen before include "craft" , "Modern airliner" .)