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Soon to become first to leave list of saints (4)

Ross

I believe the answer is:

anon

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'soon' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for anon that I've seen before include "Soon, shortly (archaic)" , "Soon; unnamed" , "Soon - nobody knows me" , "Soon, precious stone" , "coming after a call" .)

I've seen this clue in The Telegraph.
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