State of undress (6)
I believe the answer is:
nudity
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">state of undress</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 nudity that I've seen before include "State of being without clothes" , "Untidy (anag) -- result of being in one's birthday suit" , "Going without garments" , "State of complete undress" , "state some sleepers prefer" .)