Unseen, a badger tormented a bovine animal (8,5)
I believe the answer is:
aberdeen angus
'a bovine animal' is the definition.
(type of cow)
'unseen a badger tormented' is the wordplay.
'tormented' indicates anagramming the letters.
'unseen'+'a'+'badger'='unseenabadger'
'unseenabadger' is an anagram of 'ABERDEEN ANGUS'.
(Other definitions for aberdeen angus that I've seen before include "beef producer" , "Supplier of beef" , "Farm animal" , "Black, hornless breed of cattle" , "Scottish black bovine" .)