Headless, like a bull or a sheep (5)
I believe the answer is:
ovine
'sheep' is the definition.
(I've seen this in another clue)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ovine that I've seen before include "Relating to sheep" , "like a mug" , "Resembling a sheep" , "Like a sheep" , "Pertaining to sheep" .)