Erode (6)
I believe the answer is:
abrade
'erode' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for abrade that I've seen before include "Scratch" , "Day breaks? > Start as before" , "A beard (anag.)" , "Wear away by rubbing, scrape" , "Wear away by erosion" .)