Wedge-shaped bone in the lower back (6)

I believe the answer is:

sacrum

(Other definitions for sacrum that I've seen before include "Wedge-shaped bone forming the back part of the pelvis" , "Triangular bone forming back of pelvis" , "Bone in the lower back" , "Triangular bone that forms back of pelvis" .)

I've seen this clue in The Times.

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