One who wrote nonsense about the kid, perhaps (7)
I believe the answer is:
leather
This clue might be a double definition.
'one who wrote nonsense' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'the kid perhaps' is the second definition.
(kid is a kind of leather)
'about' is the link.
Can you help me to learn more?
(Other definitions for leather that I've seen before include "Treated animal skin" , "Treated hide" , "Dressed skin" , "Whip" , "kid, say" .)