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Spoke
of
what
one
has
in
each
arms
(6)
Spoke of what one has in each arms (6)
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The whole clue is the definition (& lit or double definition).
How the clue works
The definition is Spoke — as in a spoke of a wheel — and what one has in each arms is doing the same job, pointing to the bone found in each arm. Two separate definitions, both landing on the same word.