Upstart (7)
I believe the answer is:
parvenu
'upstart' is the definition.
(I know that upstart can be written as parvenu)
This is all the clue.
(Other definitions for parvenu that I've seen before include "One coming" , "Arriviste" , "Johnny-come-lately, upstart" , "Newcomer" , "One newly risen to wealth or power" .)