Has she more than one husband? (3)

I believe the answer is:

mrs

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'husband?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for mrs that I've seen before include "In short, a married woman" , "Married female" , "Married woman's title" , "Title of married woman" , "Mistress (abbrev.)" .)

I've seen this clue in the Evening Standard.

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