He showed some cleverness in writing (5)
I believe the answer is:
verne
'he' is the definition.
'showed some cleverness in writing' is the wordplay.
'VERNE' is hidden within the letters.
But, I am not sure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for verne that I've seen before include "Jules --, French author" , "Science-fiction writer" , "Jules --, French writer" , "Jules ..... wrote ` `20,000 Leagues under the Sea' '" , "See 27 Across" .)