Stoat (6)
I believe the answer is:
ermine
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stoat</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 ermine that I've seen before include "special trimmings" , "Fur-bearing mammal" , "Fur trimming on royal robes" , "Expensive white fur" , "White fur worn by some judges" .)