Relatives who can be somewhat unstable (5)

I believe the answer is:

aunts

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'relatives' is the definition.
(aunt is a kind of relative)

I can't explain the rest of the clue.

(Other definitions for aunts that I've seen before include "Elderly female relations" , "relatively speaking" , "Relatives get bad US tan" , "Relatives get an odd US tan" , "Parents' sisters" .)

I've seen this clue in the Evening Standard.

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