Vulgar, unrefined (6)
I believe the answer is:
coarse
I believe this clue is a double definition.
'vulgar' is the first definition.
(I know that vulgar can be written as coarse)
'unrefined' is the second definition.
(similar in meaning)
(Other definitions for coarse that I've seen before include "Unpolished -- ribald" , "Rough in texture or crude in manner" , "lacking in taste" , "Rought or crude" , "Vulgar - unrefined" .)