Vulgar person (4)
I believe the answer is:
boor
'vulgar person' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for boor that I've seen before include "Crude uncouth person" , "Coarse, ill-mannered person" , "Rough, bad-mannered person" , "Barbarian" , "Crude rude person" .)