Sheriff's officer (7)
I believe the answer is:
bailiff
'sheriff's officer' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bailiff that I've seen before include "Landowner's agent" , "Possibly menacing landlord's agent" , "Sheriff's officer - landlord's agent" , "Law officer who helps sheriff, say to foreclose" , "Officer of court" .)