Rub out, erase (6)
I believe the answer is:
efface
This clue is a double definition.
'rub out' is the first definition.
(I know that rub out can be written as efface)
'erase' is the second definition.
(I know that erase can be written as efface)
(Other definitions for efface that I've seen before include "Erase a mark from a surface" , "The selling of goods in large quantities" , "Obliterate by rubbing out" , "Remove all traces of" , "Expunge, delete" .)