Rock-and-roll - or rest and recreation? (1,3,1)

I believe the answer is:

r and r

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

I cannot understand how the rest of the clue works.

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(Other definitions for r and r that I've seen before include "A break from continuous service" , "relaxation" .)

I've seen this clue in the Sydney Morning Herald.

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