Workers sharing a yoke together? (4)

I believe the answer is:

oxen

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'workers' is the definition.
The definition and answer can be both animals as well as being plural nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for oxen that I've seen before include "Beef stock" , "Lowers" , "Domesticated bovine draft animals" , "Domestic bovines" , "Horned farm animals" .)

I've seen this clue in the Evening Standard.

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