Author Jules ____ (5)
I believe the answer is:
'author jules' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for verne that I've seen before include "See 14 Across" , "Science-fiction writer" , "French novelist" , "Jules, auther of Around the World in 80 Days" , "Jules --, French writer" .)