Crossword Genius

Use cast during each round (3,4)

Ross

I believe the answer is:

eat into

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'use' is the definition.
(as in using something up)

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

Can you help me to learn more?

(Other definitions for eat into that I've seen before include "start wearing out" , "Corrode (something)" , "run down" , "Consume (resources)" , "Etch" .)

I've seen this clue in The Times.
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