Can wrapper
I believe the answer is:
label
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">can wrapper</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 label that I've seen before include "Descriptive tag" , "Give name to" , "Tag or trade name" , "Mark" , "Classifying name" .)