Crossword Genius

A fatal cast (3)

Ross

I believe the answer is:

die

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'cast' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for die that I've seen before include "Engraved device that stamps design on coins" , "Cube with spots on the six faces" , "something needed for board game?" , "It may be used in a game" , "Depart with engraved stamp" .)

I've seen this clue in The Globe and Mail.
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