Sleek fabric (6)
I believe the answer is:
sateen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sleek fabric</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sateen that I've seen before include "Sea net could provide a glossy fabric" , "Glossy material" , "Closely woven cotton fabric resembling satin" , "Shiny cloth used for furnishings" , "Glossy cotton fabric" .)