BBC's relatives (7)
I believe the answer is:
aunties
'relatives' is the definition.
(aunty is a kind of relative)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for aunties that I've seen before include "Female relations" , "Older female friends" , "Parent's sisters (informal)" , "Female relatives" , "older women" .)