Crossword Genius

Ready for a fight (6)

Ross

I think it could be either:

Which length description are you looking for?:

3

6

(Other definitions for arm that I've seen before include "One fired" , "Limb; weapon" , "Test of strength with elbows on the table" , "Prime" , "Shoulder to fingertip" .)

I've seen this clue in The Wall Street Journal.
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