Allure left French love after midnight (7)
I believe the answer is:
glamour
'allure' is the definition.
(thesaurus)
'left french love after midnight' is the wordplay.
'left' becomes 'l' (common abbreviation).
'french love' becomes 'amour' (I've seen this before).
'after' says to put letters next to each other.
'midnight' becomes 'g'.
'l'+'amour'='lamour'
'lamour' put after 'g' is 'GLAMOUR'.
(Other definitions for glamour that I've seen before include "sophisticated style" , "Attractive and exciting quality" , "Romantic aura or sparkle" , "Alluring quality" , "Excitingly attractive quality" .)