Threaten animal into submission? (3)
I believe the answer is:
cow
'threaten' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cow that I've seen before include "frighten as with threats" , "Subdue in bovine manner?" , "... beast" , "Bovine female" , "Subdue with threats or force" .)