Working a lot, Parisian's ambitious (12)
I believe the answer is:
aspirational
'ambitious' is the definition.
(ambitious might mean having aspirations)
'working a lot parisian's' is the wordplay.
'working' is an anagram indicator.
'a'+'lot'+'parisian'='alotparisian'
'alotparisian' with letters rearranged gives 'ASPIRATIONAL'.
(Other definitions for aspirational that I've seen before include "Pertaining to hopes" , "Characterised by a desire to be successful" , "After a role model" , "Characterised by hope or ambition" , "Like those trying to succeed" .)