Ethnic group (5)
I believe the answer is:
tribe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ethnic group</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that tribe is a type of ethnic group)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tribe that I've seen before include "Group of people; big family" , "Extended family group" , "Breed" , "Native group" , "Group of related families" .)