Boredom at night in Paris cut short (5)
I believe the answer is:
ennui
'boredom' is the definition.
(I know that boredom can be written as ennui)
'at night in paris cut short' is the wordplay.
'at' becomes 'en' (I am not sure about this - if you are sure you should believe this answer much more).
'night in paris' becomes 'nuit' ('night' in French).
'cut short' means to remove the last letter.
'nuit' with its final letter taken away is 'nui'.
'en'+'nui'='ENNUI'
Can you help me to learn more?
(Other definitions for ennui that I've seen before include "Lower interest rate" , "Lack of interest" , "Sense of tedium" , "Feeling when tired of life?" , "Boredom, dullness" .)