Fragment of glass (5)
I believe the answer is:
shard
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fragment of glass</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 shard that I've seen before include "Piece of broken ceramic - London skyscraper" , "Go well with; attire" , "Scrap of pottery" , "remnant after break-up" , "Sliver of glass, etc" .)