Woman's light dressing gown (8)
I believe the answer is:
negligee
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">woman's light dressing gown</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 negligee that I've seen before include "Diaphanous dressing-gown" , "Woman's flimsy nightgown" , "Woman's light and flimsy dressing gown" , "Lady's diaphanous dressing gown" , "Nightie" .)