Feudal laborer (4)
I believe the answer is:
serf
'feudal laborer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for serf that I've seen before include "Medieval villein" , "Tied estate worker" , "Old worker" , "'In the Middle Ages, a person owned by a feudal lord (4)'" , "Person required to work for a lord" .)