Buff colour (7)
I believe the answer is:
nankeen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">buff colour</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 nankeen that I've seen before include "hard-wearing stuff" , "Buff-coloured cotton cloth" , "Chinese cotton cloth" , "mustard colour" , "Buff-coloured cotton fabric" .)