Not having heard of French article about some fighting (7)
I believe the answer is:
unaware
'not having heard' is the definition.
'french article about some fighting' is the wordplay.
'french article' becomes 'une' (French article in the part-of-speech sense).
'about' indicates putting letters inside.
'some' becomes 'a'.
'fighting' becomes 'war'.
'a'+'war'='awar'
'une' enclosing 'awar' is 'UNAWARE'.
'of' is the link.
(Other definitions for unaware that I've seen before include "Innocent" , "Not cognisant" , "Oblivious to, not knowing" , "Unwitting, not knowing" , "Ignorant - unacquainted" .)