No aristocrat (8)
I believe the answer is:
commoner
'no aristocrat' is the definition.
(ordinary person as opposed to an aristocrat)
This is all the clue.
(Other definitions for commoner that I've seen before include "Not a nobleman" , "A non-aristocrat" , "He's not a member of the nobility" , "certain type of undergraduate" , "One not of noble rank" .)