Joint work schedules must have end of shift moved (5)

I believe the answer is:

roast

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'joint' is the definition.
(I know that joint can be written as roast)

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

(Other definitions for roast that I've seen before include "Sunday meal" , "Cooked joint" , "Sunday dinner" , "Get very warm" , "Berate - cook" .)

I've seen this clue in The Independent.

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