Pester; animal (6)
I believe the answer is:
badger
I believe this is a double definition.
'pester' is the first definition.
(synonyms)
'animal' is the second definition.
(I've seen this before)
(Other definitions for badger that I've seen before include "Animal hunted by stocky dog" , "Member of the weasel family" , "Pester - nocturnal animal" , "Mammal, striped head" , "Countryside mammal" .)