Shaggy ox (3)
I believe the answer is:
yak
'shaggy ox' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for yak that I've seen before include "Long-haired ox of Tibet" , "Gossip; ox" , "Bos grunniens" , "Idle talk" , "one sporting a thick coat" .)