Carton (3)
I believe the answer is:
box
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">carton</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for box that I've seen before include "Tackle defender" , "Fight; tree; container" , "Topiary shrub" , "Wooden case" , "Spar; tree" .)