Kind of paper associated with numbskulls! (8)
I believe the answer is:
foolscap
'kind of paper' is the definition.
(I know that foolscap is a type of piece of paper)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for foolscap that I've seen before include "sheet" , "About 330 x 200 (or 400) mm size of paper" , "Cop's foal (anag)" , "One would not be wise to put this on" , "type of paper" .)