Harass an animal (6)
I believe the answer is:
badger
This clue is a double definition.
'harass' is the first definition.
(synonyms)
'animal' is the second definition.
(I've seen this before)
'an' is the link.
(Other definitions for badger that I've seen before include "Black and white burrower" , "A mammal; harry" , "One tagging" , "protected species" , "Grab Ed from the animal" .)