Not glossy (5)
I believe the answer is:
matte
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not glossy</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 matte that I've seen before include "Mask used to block out areas of the image in filming" , "Mask used to record two images on same film" , "Mask used in film; ET mat (anag.)" , "Mask used to add an image in front of camera" , "A dull finish" .)