French miss typical ending for superlative fashion mag (7)
I believe the answer is:
estelle
'french miss' is the definition.
(French name)
'typical ending for superlative fashion mag' is the wordplay.
'typical ending for superlative' becomes 'est' (suffix in superlatives like 'biggest').
'fashion mag' becomes 'Elle' (Elle is a fashion magazine).
'est'+'elle'='ESTELLE'
(Other definitions for estelle that I've seen before include "Star girl" , "Lets Lee produce a girl's name" .)