Villein (4)
I believe the answer is:
serf
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">villein</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that villein can be written as serf)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for serf that I've seen before include "One bound to work" , "Feudal estate worker" , "who got into bondage" , "Slave" , "Feudal subject" .)