A French and a Western leader are in the dark (7)
I believe the answer is:
unaware
'in the dark' is the definition.
(I've seen this before)
'a french and a western leader are' is the wordplay.
'a french' becomes 'un' ('a' in French).
'leader' suggests taking the first letters.
The initial letters of 'and western' is 'aw'.
'un'+'aw'+'are'='UNAWARE'
(Other definitions for unaware that I've seen before include "Without knowledge" , "Not conscious of what is going on" , "Lacking knowledge (of a situation or fact)" , "Uninformed" , "Ignorant - unconscious" .)