Unilluminated (5)
I believe the answer is:
unlit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unilluminated</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that unilluminated can be written as unlit)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for unlit that I've seen before include "Not yet burning" , "not exactly bright" , "Shadowy" , "such as dark alley?" , "Dark, gloomy" .)