Not transparent (6)
I believe the answer is:
opaque
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not transparent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for opaque that I've seen before include "Hazy, unclear" , "Not clear, resistant to light" , "Puzzling - dull" , "Nebulous, unclear" , "Cloudy, not transparent" .)