Light grey (4)
I believe the answer is:
ashy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">light grey</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ashy that I've seen before include "like Cinders" , "like a cinder track?" , "Dusty" , "Wan" , "covered in dust" .)