Feudal subordinate (6)
I believe the answer is:
vassal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">feudal subordinate</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 vassal that I've seen before include "A medieval servant" , "Feudal retainer" , "A humble servant as of 9 Down" , "Feudal underling" , "Person or nation subject to another" .)