Chewed like a beaver (6)
I believe the answer is:
gnawed
'chewed like a beaver' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gnawed that I've seen before include "Nibbled - chewed" , "Persistently nibbled" , "Chewed at like dog with bone" , "Wore away; champed" , "Bit or chewed persistently" .)