Put on airs ridiculously, like a French author (9)
I believe the answer is:
proustian
'like a french author' is the definition.
(reminiscent of Marcel Proust)
'put on airs ridiculously' is the wordplay.
'ridiculously' indicates an anagram.
'put'+'on'+'airs'='putonairs'
'putonairs' anagrammed gives 'PROUSTIAN'.
(Other definitions for proustian that I've seen before include "like a French writer" , "Admirer of author" .)