Crossword Genius

They are engaged in making machines work (4)

Ross

I believe the answer is:

cogs

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'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for cogs that I've seen is " Teeth on the edge of a wheel".)

I've seen this clue in The Irish Independent.
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