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