Lowborn Roman in plea — be for change (8)
I believe the answer is:
plebeian
'lowborn roman' is the definition.
(term for a commoner in ancient Rome)
'in plea be for change' is the wordplay.
'for change' indicates an anagram (I've seen this in other clues).
'in'+'plea'+'be'='inpleabe'
'inpleabe' anagrammed gives 'PLEBEIAN'.
(Other definitions for plebeian that I've seen before include "Lacking in refinement" , "not refined" , "Common person" , "Common, proletarian" , "(Roman) commoner" .)