Hide or display (6)
I believe the answer is:
screen
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">hide</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">display</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(screen is a kind of display)</span><br/ ><br/ ></span>
(Other definitions for screen that I've seen before include "Show pictures on the surface" , "Surface for projection of pictures" , "Room divider" , "Sort out" , "Shield - broadcast" .)