Breakfast item completely finished! (5)

I believe the answer is:

toast

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'breakfast item' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for toast that I've seen before include "Brown by radiant heat" , "Grill - clinking of glasses" , "Make bread brown and crisp" , "Grilled bread - drink (to)" , "Raise a glass to (someone)" .)

I've seen this clue in The Times.

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