Memorial plate (6)
I believe the answer is:
plaque
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">memorial plate</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 plaque that I've seen before include "Dental coating" , "dental hygiene problem" , "Trophy" , "film in bad taste?" , "Memorial plate" .)