Writer never worried (5)
I believe the answer is:
verne
'writer' is the definition.
(I've seen this before)
'never worried' is the wordplay.
'worried' indicates anagramming the letters (worry can mean to interfere with or disturb).
'never' anagrammed gives 'VERNE'.
(Other definitions for verne that I've seen before include "Science-fiction writer" , "Jules, auther of Around the World in 80 Days" , "See 27 Across" , "See 14 Across" , "Jules --, French writer" .)