Line of seats (3)
I believe the answer is:
row
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">line of seats</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 row that I've seen before include "Line, tier" , "Propel boat manually" , "Barney - rank" , "Series" , "Disagreement" .)