Incorrectly read sloppy printer's item (12)
I believe the answer is:
misinterpret
'incorrectly read' is the definition.
'misinterpret' can be an answer for 'read' (misinterpreting is a kind of reading). I'm not sure about the 'incorrectly' bit.
'sloppy printer's item' is the wordplay.
'sloppy' is an anagram indicator.
'printers'+'item'='printersitem'
'printersitem' is an anagram of 'MISINTERPRET'.
Can you help me to learn more?
(Other definitions for misinterpret that I've seen before include "Fail to understand" , "Read wrongly" , "Explain wrongly" , "get wrong" , "Take the wrong way" .)