She's been married at least once (5)

I believe the answer is:

widow

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'she's' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

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(Other definitions for widow that I've seen before include "Grass --, divorced woman" , "Relict" , "One losing partner" , "Woman whose husband is dead" , "The Merry --, operetta" .)

I've seen this clue in the Evening Standard.

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