Group of families (4)
I believe the answer is:
clan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">group of families</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 clan that I've seen before include "Tribal group with common ancestor" , "Extended family as in Scotland" , "People related by blood and marriage" , "Group of families with common ancestor" , "Large family forming close group, big in Scotland" .)