Queue (4)
I believe the answer is:
line
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">queue</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a line of people)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for line that I've seen before include "Railway track; policy" , "An American queue" , "Row; track" , "Wrinkle, boundary" , "Long mark; direction" .)