Washed away (6)
I believe the answer is:
eroded
'washed away' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eroded that I've seen before include "Worn away by time, wind or water" , "Eaten away" , "Worn away, ground down" , "Wore away" , "Worn away by weather or water" .)