24 across
Severely
criticize
cook
(5)
Severely criticize cook (5)
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The whole clue is the definition (& lit or double definition).
How the clue works
The definition is Severely criticize — to roast someone is to give them a proper dressing-down. But cook works just as well as a definition, since roasting is of course a method of cooking too, making this a lovely double definition.