Shaggy-haired ox (3)
I believe the answer is:
yak
'shaggy-haired ox' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for yak that I've seen before include "Hairy Asian ox" , "Wild ox" , "Himalayan bovine" , "A long-haired Asian ox" , "Himalayan ox" .)