Writer of nonsensical verse both sides repeated in song (7)
I believe the answer is:
carroll
'writer' is the definition.
(I know that Carroll has the has the occupation writer)
'of nonsensical verse both sides repeated in song' is the wordplay.
I cannot quite understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
'sides' could be 'rl' (abbreviations for left and right) and 'rl' is located in the leftover letters.
The remaining letters 'carl' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for carroll that I've seen before include "Lewis - - , 28 creator" , "writer of fiction !" , "See 17" , "Writer of nonsense" , "Pen name of Dodgson" .)