Waist sash (10)
I believe the answer is:
cummerbund
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">waist sash</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cummerbund that I've seen before include "Sash round waist" , "Evening dress waist band" , "Broad sash" .)