Gloom of the Parisian couple (7)
I believe the answer is:
despair
'gloom' is the definition.
(I've seen this before)
'of the parisian couple' is the wordplay.
'of the parisian' becomes 'des' ('of the' in French).
'couple' becomes 'pair' (synonyms).
'des'+'pair'='DESPAIR'
(Other definitions for despair that I've seen before include "State of having lost all hope" , "Be without hope" , "An unhappy state" , "Despondency" , "Despond" .)