Answer: GNAWERS

AnswerCrossword Clue
GNAWERSBeavers, at times
GNAWERSBeavers, e.g.
gnawersto cause distress
gnawersto wear away
gnawersGNAWER, one that gnaws (to wear away by persistent biting)
gnawersto bite persistently
gnawersto bite on persistently