Relatively young ladies (6)

I believe the answer is:

nieces

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'relatively young ladies' is the definition.
The answer and definition can be both people as well as being plural nouns.
Maybe they are linked in a way I don't understand?

This is all the clue.

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(Other definitions for nieces that I've seen before include "Young female relatives" , "Relative girls" , "They're family" , "Relations" , "Relatives of 27dn" .)

I've seen this clue in the Evening Standard.

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