Perhaps lackey's son to become ordinary kind of farmer (6)
I believe the answer is:
yeoman
'farmer' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for yeoman that I've seen before include "Historically, English freeholders and footsoldiers" , "(Of old) a free person cultivating his own land" , "Royal attendant" , "Old English soldier or small farmer" , "Warder of the Tower of London" .)