They depend on cattle and the elderly (7)

I believe the answer is:

dewlaps

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'they' is the definition.
Both the definition and answer are plural nouns.
Perhaps you can see an association between them that I don't see?

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

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(Another definition for dewlaps that I've seen is " Folds of loose skin hanging below neck".)

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

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