Adhesive label (7)
I believe the answer is:
sticker
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">adhesive label</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sticker that I've seen before include "Gummed label" , "Adhesive label" , "Person with staying power" , "he soldiers on!" , "problem" .)