Crossword Genius

Radius partner (4)

Ross

I believe the answer is:

ulna

'radius partner' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for ulna that I've seen before include "The longer and inner bone in forearm" , "Thinner of two long bones in forearm" , "Part of bone-structure" , "a section of framework" , "One in arms" .)

I've seen this clue in The Times, the King Feature Syndicate and The Sunday Times.
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