Brother or sister (7)

I think it could be either:

Which length description are you looking for?:

sibling

'brother or sister' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sibling that I've seen before include "Bro, perhaps" , "Close relative" , "Bro or sis" , "One's brother or sister" , "Maybe brother" .)

I've seen this clue in The Daily Mail, The Mirror and the Sydney Morning Herald.

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