Crossword Genius

One of those remedies that don’t work? (4-4)

Ross

I believe the answer is:

rest-cure

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This clue might be a double definition.

'one of those remedies that don't' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'work?' is the second definition.
(rest-cure is a kind of work)

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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