Wear or scrape away (6)
I believe the answer is:
abrade
I believe this clue is a double definition.
'wear' is the first definition.
(I've seen this before)
'scrape away' is the second definition.
(I've seen this in another clue)
(Other definitions for abrade that I've seen before include "Rub off or scrape away" , "Scrape away, erode" , "Wear away by friction" , "Wear away by rubbing, scrape" , "Wear away by rubbing (6)" .)