Compound zoned to hold yak hybrid (3)

I believe the answer is:

dzo

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

'hybrid' is the definition.
(I know that dzo is a hybrid)

'compound zoned to hold' is the wordplay.
'to hold' indicates a hidden word (I've seen 'holds' mean this).
'DZO' can be found hidden inside 'compound zoned'.

'yak' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Another definition for dzo that I've seen is " Animal".)

I've seen this clue in the Sydney Morning Herald.

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