Crossword Genius

Beast that is cross — bull initially confined (4)

Ross

I believe the answer is:

ibex

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(Other definitions for ibex that I've seen before include "Sure-footed type" , "Pyrenean mountain goat" , "Wild goat with double curved horns" , "Mountain goat with curving horns" , "Wild goat of North Africa" .)

I've seen this clue in The Times.
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