'First Lady' in France creating excitement (5)
I believe the answer is:
fever
'excitement' is the definition.
(fever is a kind of excitement)
'first lady in france' is the wordplay.
'first lady' becomes 'eve' (I've seen this before**).
'in' means one lot of letters goes inside another.
'france' becomes 'fr'.
'eve' inserted within 'fr' is 'FEVER'.
'creating' acts as a link.
(Other definitions for fever that I've seen before include "Masefield's desire for the sea" , "Elvis hit" , "(Illness causing) high temperature" , "Heat of disease or extreme excitement" , "Ague, abnormally high body temperature" .)