Read the riot act over cheese (7)

I believe the answer is:

ricotta

I'm a little stuck... Click here to teach me more about this clue!

'cheese' is the definition.
(I know that Ricotta is a cheese)

'read the riot act over' is the wordplay.
'riot act' can be anagrammed to 'RICOTTA'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for ricotta that I've seen before include "may be served with biscuits" , "Sheep's milk cheese" , "Italian 4 across" , "one brought on board?" , "Cheese - Riot Act (anag)" .)

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

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