Printed material endlessly creates confusion (4)

I believe the answer is:

blur

I'm a little stuck... Click here to teach me more about this clue!

'printed material endlessly creates confusion' is the definition.
I can't tell whether this definition defines the answer.

'material endlessly creates confusion' is the wordplay.
'material' becomes 'BM' (BM is an example).
'endlessly' means to remove the last letter.
'creates confusion' becomes 'lur' (I can't explain this - if you can you should believe this answer much more).
'bm' with its last letter taken off is 'b'.
'b'+'lur'='BLUR'

Can you help me to learn more?

(Other definitions for blur that I've seen before include "Out-of-focus sight" , "Make vague" , "murky spot" , "Obscure; smudge" , "fade" .)

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app