Train — bus (5)
I believe the answer is:
coach
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">train</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that coach is a action)</span><br/ ><br/ >'<span class="explanation-format__original">bus</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that bus can be written as coach)</span><br/ ><br/ ></span>
(Other definitions for coach that I've seen before include "Trainer and train carriage" , "Tutor" , "Instruct" , "Railway carriage or sports instructor" , "Train - or part of one!" .)