Radius or ulna (4)

I think it could be either:

Which length description are you looking for?:

bone

This clue is a double definition.

'radius' is the first definition.
(radius is an example)

'ulna' is the second definition.
(thesaurus)

(Other definitions for bone that I've seen before include "#Close to it is risque" , "How dry" , "See 6" , "Part of skeleton" , "Eg, radius or stirrup" .)

I've seen this clue in the USA Today, the King Feature Syndicate and The Washington Post.

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