Rustic labourer originally thrown out of Nice (7)
I believe the answer is:
peasant
'rustic' is the definition.
(I know that peasant is a type of rustic)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for peasant that I've seen before include "Poor farmworker" , "Agricultural labourer of low status" , "Member of rural underclass" , "Country labourer" , "Rustic fellow" .)