Trucker's compartment (3)
I believe the answer is:
cab
'trucker's compartment' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cab that I've seen before include "info for citizens provided here" , "An American taxi" , "Transport" , "Taxi to hold an engine-driver" , "It has the authority to confiscate the proceeds of crime, in short" .)