Printed material endlessly creates muddle (4)
I believe the answer is:
blur
'muddle' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for blur that I've seen before include "British rock group" , "Hazy or indistinct representation" , "Haze - obscure" , "Unfocused image" , "Muddle" .)