Military fur hat (5)
I believe the answer is:
busby
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">military fur hat</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 busby that I've seen before include "Bearskin hat" , "Mil. bearskin (colloq.)" , "Guardsman's helmet" , "Military fur hat" , "Hussar's hat" .)