Part of silver necklace for French author (5)
I believe the answer is:
verne
'french author' is the definition.
(Jules Verne)
'part of silver necklace for' is the wordplay.
'part of' indicates a hidden word.
'VERNE' is hidden within 'silver necklace for'.
(Other definitions for verne that I've seen before include "Jules, auther of Around the World in 80 Days" , "French novelist" , "Jules --, French writer" , "See 27 Across" , "See 14 Across" .)