Everlasting conclusions about the French (7)
I believe the answer is:
endless
'everlasting' is the definition.
(I've seen this before)
'conclusions about the french' is the wordplay.
'conclusions' becomes 'ends' (end is a kind of conclusion).
'about' is an insertion indicator.
'the french' becomes 'les' (les is the in french).
'ends' going around 'les' is 'ENDLESS'.
(Other definitions for endless that I've seen before include "Tiresomely long" , "Without limit" , "Continual" , "With no limit in sight" , "Potentially boring" .)