Bone in the forearm (4)

I believe the answer is:

ulna

'bone in the forearm' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for ulna that I've seen before include "Bone from the human elbow" , "Radius partner" , "Part of body" , "part of anatomy" , "Inner bone of the human forearm" .)

I've seen this clue in The Irish Times, The Telegraph, The Guardian, The Washington Post and The New York Times.

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