Applied to paper to have mistakes removed (6)
I believe the answer is:
eraser
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for eraser that I've seen before include "Obliterator" , "One removes writing" , "Stationery item" , "Rubber, thing that wipes out" , "A student's rubber, or the one who uses it" .)