Go by car or train (4)
I believe the answer is:
ride
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">go by car</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">train</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ ></span>
(Other definitions for ride that I've seen before include "Journey as passenger" , "Travel, by horse say" , "Sit on (a horse/vehicle)" , "Take journey" , "Fairground entertainment" .)