Without light (4)
I believe the answer is:
dark
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">without light</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for dark that I've seen before include "Devoid of brightness" , "Black, perhaps - night" , "Dimly lit" , "Swarthy" , "Such an unknown horse" .)