Crossword Genius

The one cast irrevocably? (3)

Ross

I believe the answer is:

die

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'the one cast' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for die that I've seen before include "Device that stamps design on metal" , "one's cast" , "Cease to exist" , "Craps cube" , "One of a pair of dice" .)

I've seen this clue in the Evening Standard.
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