French lethargy (5)
I believe the answer is:
ennui
This clue could be a double definition.
'french' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'lethargy' is the second definition.
(I've seen this in another clue)
Can you help me to learn more?
(Other definitions for ennui that I've seen before include "Boredom, tedium" , "having nothing to do" , "Boredom, listlessness" , "Low interest rate" , "Lack of interest" .)