Window screen (5)
I believe the answer is:
blind
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">window screen</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 blind that I've seen before include "Failing to see" , "Unobserving" , "Visually challenged" , "Unable to see - screen" , "Unseeing" .)