Sensation appears to start around funny bone (6)

I believe the answer is:

sacrum

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'bone' is the definition.
(I know that sacrum is a bone)

I can't explain the rest of the clue.

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

I've seen this clue in The Independent.

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