Masked (6)
I believe the answer is:
hooded
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">masked</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hooded that I've seen before include "With head and back of the neck covered" , "Dressed in a cowl" .)