They should know how to prepare a good meal (7)

I believe the answer is:

millers

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'they' is the definition.
Both the answer and definition are plural nouns.
Maybe you can see a link between them that I don't see?

I can't explain the remainder of the clue.

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(Another definition for millers that I've seen is " Corn grinders".)

I've seen this clue in The Globe and Mail.

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