Lunar ray (8)
I believe the answer is:
moonbeam
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lunar ray</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 moonbeam that I've seen before include "Natural light" , "A lunar ray of light" , "Lunar shaft of light" , "dim light?" , "Night light?" .)