Answer: gnawer

AnswerCrossword Clue
GNAWERBeaver or dog, at times
GNAWERBusy beaver
GNAWERRodent, often
GNAWERBeaver, at times
GNAWERRodent.
GNAWERBeaver.
GNAWERRodent
GNAWERBeaver, for one
GNAWERMouse, for example
gnawerto wear away
gnawerto bite on persistently
gnawerto bite persistently
gnawerone that gnaws (to wear away by persistent biting)
gnawerto cause distress