Transparency (5)
I believe the answer is:
slide
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">transparency</span>' is the definition.<br/ ><span class="explanation-format__explanation">(slide is a kind of transparency)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for slide that I've seen before include "Idles about on children's chute" , "Playground item" , "Drop" , "Playground structure" , "Playground chute" .)