Scraping good assessment (7)
I believe the answer is:
grating
'scraping' is the definition.
('grate' can be a synonym of 'scrape')
'good assessment' is the wordplay.
'good' becomes 'g' (abbreviation).
'assessment' becomes 'rating' (rating is a kind of assessment).
'g'+'rating'='GRATING'
(Other definitions for grating that I've seen before include "Frame of bars supporting a fire" , "Rasping - grille" , "Unpleasantly harsh in sound" , "Harsh - framework of crossed bars" , "Screen of bars across opening" .)