Needs to be seen in the French city (5)
I believe the answer is:
lhasa
'city' is the definition.
(Lhasa is an example)
'needs to be seen in the french' is the wordplay.
'needs' becomes 'has' ('have' can be a synonym of 'need').
'to be seen in' means one lot of letters goes inside another.
'the french' becomes 'la' ('the' in French).
'has' placed within 'la' is 'LHASA'.
(Other definitions for lhasa that I've seen before include "Luxembourg's a" , "Tibet's "Forbidden City"" , "Capital of Tibet" , "Asian capital" , "foreign capital" .)