Pioneer's vehicle (5)
I believe the answer is:
wagon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pioneer's vehicle</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 wagon that I've seen before include "Vehicle (on which abstainers travel?)" , "Four-wheeled goods vehicle" , "Freight truck" , "On this, one keeps dry!" , "Trailer, railway truck" .)