Devoured one sheep, noisily (3,2)

I believe the answer is:

ate up

'devoured' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

(Other definitions for ate up that I've seen before include "Absorbed" , "preoccupied" , "Squandered" .)

I've seen this clue in The Everyman puzzle in The Observer.

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