Pelvic bones (5)

I think it could be either:

Which length description are you looking for?:

sacra

'pelvic bones' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sacra that I've seen before include "Bones that form the human pelvic arch" , "Triangular bones" .)

I've seen this clue in The Times, The New York Times, the LA Times and The Sunday Times.

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