A Parisian welcoming a fight in the dark (7)
I believe the answer is:
unaware
'in the dark' is the definition.
(I've seen this before)
'a parisian welcoming a fight' is the wordplay.
'a parisian' becomes 'une' ('a' in French).
'welcoming' is an insertion indicator (in sense of 'inviting in').
'fight' becomes 'war' (warring is a kind of fighting**).
'a'+'war'='awar'
'une' enclosing 'awar' is 'UNAWARE'.
(Other definitions for unaware that I've seen before include "Ignorant - unacquainted" , "Not cognisant" , "Heedless" , "Oblivious to, not knowing" , "Ignorant, oblivious" .)