Routing word (3)
I believe the answer is:
via
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">routing word</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 via that I've seen before include "Passing through" , "Roman road" , "By way of - in Latin" , "By means of" , "Going through" .)