Marx brother (7)
I believe the answer is:
groucho
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">marx brother</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 groucho that I've seen before include "One of Harpo's brothers" , "One of Marx Brothers" , "One of four comedian brothers" , "The Marx Brother with the moustache" , "Funny man" .)