Girl seen in French city (5)
I believe the answer is:
nancy
This clue is a double definition.
'girl' is the first definition.
'french city' is the second definition.
(city in France)
'seen in' acts as a link.
(Other definitions for nancy that I've seen before include "Girl; French city" , "City in Europe" , "in Oliver?" , "Dickensian heroine" , "City in Lorraine" .)