Crossword Genius

Supply a German hub (3)

Ross

I believe the answer is:

arm

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This might be a double definition.

'supply' is the first definition.
(to arm someone with something is to supply it)

'a german hub' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for arm that I've seen before include "What soldiers do" , "Human limb" , "Authority" , "inlet" , "Division of company" .)

I've seen this clue in the Sydney Morning Herald.
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