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Eventually a number start to die, alas (7)

Ross

I believe the answer is:

someday

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

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

Can you help me to learn more?

(Other definitions for someday that I've seen before include "An unspecified time in the future" , "eventually" , "When will my prince come" , "song" , "At a future time; samoyed (anag.)" .)

I've seen this clue in the Sydney Morning Herald.
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