From the back of the drawer, certain scraping out (7)
I believe the answer is:
erasure
'scraping out' is the definition.
'erasure' can be an answer for 'scraping' (thesaurus). I'm unsure of the 'out' bit.
'from the back of the drawer certain' is the wordplay.
'from' becomes 'e' (I've seen this in other clues).
'the back of the drawer' becomes 'ra' (I can't justify this - if you can you should give a lot more credence to this answer).
'certain' becomes 'sure' (synonyms).
'e'+'ra'+'sure'='ERASURE'
Can you help me to learn more?
(Other definitions for erasure that I've seen before include "Wiping out - English pop duo" , "Rubbing out - English synthpop duo" , "Obliteration of data" , "Deletion by an act of expunging" , "clearing of tape" .)