Rolls dished up with the roast (5)

I believe the answer is:

rotas

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'rolls' is the definition.
(rota is a kind of roll)

'dished up with the roast' is the wordplay.
'roast' can be anagrammed to 'ROTAS'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for rotas that I've seen before include "Rolls" , "they tell us when to work" , "Rosters" , "Cycles of duty" , "Duty lists" .)

I've seen this clue in the Evening Standard.

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