The French politician finds illumination (4)
I believe the answer is:
lamp
'illumination' is the definition.
(I know that lamp is a type of electric light)
'the french politician' is the wordplay.
'the french' becomes 'la' (one of the French words for 'the').
'politician' becomes 'MP' (Member of Parliament).
'la'+'mp'='LAMP'
'finds' is the link.
(Other definitions for lamp that I've seen before include "Artificial source of illumination" , "Appliance producing light" , "Source of light, usually portable" , "Clout" , "Device for giving light on palm" .)