Good Parisian about to become someone important (3)
I believe the answer is:
nob
'someone important' is the definition.
(nob can mean an aristocrat)
'good parisian about' is the wordplay.
'good parisian' becomes 'bon' ('good' in French).
'about' says the letters should be written backwards.
'bon' written backwards gives 'NOB'.
'to become' acts as a link.
(Other definitions for nob that I've seen before include "A slang toff - c'est bon" , "Person of wealth or high social position" , "A posh gent - c'est bon" , "A slangy person of high rank - c'est bon" , "Jack" .)