Is she the one for a Frenchman? (5)
I believe the answer is:
irene
'is she' is the definition.
(I've seen this before)
'one for a frenchman?' is the wordplay.
'one' becomes 'i' (Roman numeral).
'for' is a charade indicator (letters next to each other).
'a frenchman?' becomes 'rene' (common French name).
'i'+'rene'='IRENE'
'the' acts as a link.
(Other definitions for irene that I've seen before include "Representative of peace" , "Girl's name; Soames Forsyte's first wife" , "Peaceful girl" , "Girl of peace" , "- - Handl, actress" .)