Crossword Genius

Himalayan ox is all right over going without oxygen (3)

Ross

I believe the answer is:

yak

'himalayan ox' is the definition.
(I've seen this before)

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

(Other definitions for yak that I've seen before include "one sporting a thick coat" , "Persistent talk" , "Hairy Tibetan ox" , "Long-haired ox of Tibet" , "Gossip; ox" .)

I've seen this clue in The Times.
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