A French work put forward not challenged (9)
I believe the answer is:
unopposed
'not challenged' is the definition.
(without being challenged or opposed)
'a french work put forward' is the wordplay.
'a french' becomes 'un' ('a' in French).
'work' becomes 'op' (abbreviation for opus).
'put forward' becomes 'posed' (I've seen this in another clue).
'un'+'op'+'posed'='UNOPPOSED'
(Other definitions for unopposed that I've seen before include "Without challenge" , "Assembly" , "Nem con" , "Elected . . . . . . . . .; no other candidate" , "so carried?" .)