New nans due to become responsible older women (7)

I believe the answer is:

duennas

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'responsible older women' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'new nans due' is the wordplay.
'new' is an anagram indicator.
'nans'+'due'='nansdue'
'nansdue' with letters rearranged gives 'DUENNAS'.

'to become' is the link.

Can you help me to learn more?

(Another definition for duennas that I've seen is " Governesses".)

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