Backspaces over (6)
'backspaces over' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for deletes that I've seen before include "Erases" , "Crosses out" .)
(Other definitions for erases that I've seen before include "Removes all traces" , "Obliterates" , "Rubs out, deletes" .)