He showed some cleverness as a writer (5)
I believe the answer is:
verne
'writer' is the definition.
(I've seen this before)
'he showed some cleverness as a' is the wordplay.
'VERNE' is hidden within the letters.
However, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for verne that I've seen before include "Jules --, French writer" , "See 27 Across" , "Jules --, French author" , "See 14 Across" , "French novelist" .)