Beefeater (6)
I believe the answer is:
yeoman
'beefeater' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for yeoman that I've seen before include "Royal guard" , "Historical freeholder" , "Old landholder; member of The Guard" , "(Of old) a free person cultivating his own land" , "Beefeater was this Tower warden's nickname" .)