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' anagrams to 'ROTAS'.
But, I'm unsure 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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