Postage sticker (5)
I believe the answer is:
stamp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">postage sticker</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 stamp that I've seen before include "Bring foot down hard" , "Impress with a mark" , "What to put on 7 before putting in 15" , "Use a die; character" , "making an impression?" .)