Error remnant (7)
I believe the answer is:
erasure
'error remnant' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for erasure that I've seen before include "Rubbing out - English synthpop duo" , "Band with Andy Bell and Vince Clarke, or wipe-out" , "Obliteration of data" , "Deletion by an act of expunging" , "Censorship" .)