Eraser (6)
'eraser' is the definition.
(I know that rubber is a type of eraser)
This is the entire clue.
(Other definitions for rubber that I've seen before include "It can remove so-called lead" , "material for band" , "Stretchy substance" , "Latex product" , "Elastic substance; set of bridge games" .)
'eraser' is the definition.
(ink eraser is a kind of eraser)
This is all the clue.
(Other definitions for ink that I've seen before include "Pen's contents" , "See 9" , "Liquid from a squid" , "Printer's medium" , "Dark liquid" .)