Crossword Genius

Of an arm nerve (5)

Ross

I believe the answer is:

ulnar

(Other definitions for ulnar that I've seen before include "of certain bones" , "Relating to one of the bones of the forearm" , "Relating to a particular arm bone" , "Relating to a bone in the forearm" .)

I've seen this clue in the LA Times and The Wall Street Journal.
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