Nonsense writer without the material (7)
I believe the answer is:
leather
'material' is the definition.
(I've seen this before)
'nonsense writer without the' is the wordplay.
'nonsense writer' becomes 'lear' (I have seen 'comic writer' mean 'lear' so perhaps 'writer' could also mean 'lear'. I am not sure about the 'nonsense' bit.).
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'lear' going around 'the' is 'LEATHER'.
Can you help me to learn more?
(Other definitions for leather that I've seen before include "Treated animal skin" , "Thrash" , "calf" , "Processed animal skin" , "kid, perhaps" .)