Crossword Genius

Animal hard to hit? (4)

Ross

I believe the answer is:

bull

I'm a little stuck... Click here to teach me more about this clue!

'animal' is the definition.
(bull is a kind of animal)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bull that I've seen before include "Animal; 23 across" , "Male cow" , "motion is > nonsense" , "Male walrus" , "Bovine animal" .)

I've seen this clue in the Evening Standard.
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