Pesters (7)
I believe the answer is:
badgers
'pesters' is the definition.
('badger' can be a synonym of 'pester')
This is all the clue.
(Other definitions for badgers that I've seen before include "Pesters; black and white nocturnal animals" , "Bullies" , "Burrowing mammals with strong claws" , "Pesters like burrowing animals" .)