Its used for removing unwanted records (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 "It could remove" , "Correcting implement used in drawing or writing" , "Stationery item" , "Required, should you make a mistake" , "One who removed" .)