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Such a story remains secret (6)

Ross

I believe the answer is:

untold

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'secret' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for untold that I've seen before include "enormous" , "Lots" , "Countless" , "extensive" , "missing relations" .)

I've seen this clue in The Hindu.
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