Truck driver's compartment (3)
I believe the answer is:
cab
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">truck driver's compartment</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cab that I've seen before include "Driving compartment" , "Hackney" , "vehicle" , "Transport" , "Taxi to hold an engine-driver" .)