Photoshop tool (6)
I believe the answer is:
eraser
'photoshop tool' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eraser that I've seen before include "Rubber for removing marks" , "(Pencil, ink) rubber" , "A schoolboy's rubber" , "What a poor artist needs" , "Required, should you make a mistake" .)