Russian royal dynasty (7)
I believe the answer is:
romanov
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">russian royal dynasty</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 romanov that I've seen before include "Russian imperial line that ruled from 1613 to 1917" , "Russian house" , "one of 23 [DYNASTY]" , "(Member of) Russian imperial dynasty" , "Russian dynasty before the Bolshevik Revolution" .)