Proletarian (4)
I believe the answer is:
pleb
'proletarian' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pleb that I've seen before include "Term used for a member of the lower classes" , "Person of vulgar tastes (colloq.)" , "Common guy" , "Commoner" , "Boor" .)