See-through items (5)
I believe the answer is:
panes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">see-through items</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for panes that I've seen before include "Glass slabs" , "Sheet glass cut for windows" , "Glass rectangles in windows" , "Glass pieces in windows" , "Sheets of window glass" .)