Cover or envelop (6)
I believe the answer is:
shroud
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">cover</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">envelop</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(shrouding is a kind of enveloping)</span><br/ ><br/ ></span>
(Other definitions for shroud that I've seen before include "Envelop (in cloud, for instance)" , "Conceal from view" , "hide" , "Cloth wrap for corpse" , "Covering shift" .)