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Conductor travelled to support those chosen (9)

Ross

I believe the answer is:

electrode

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'conductor' is the definition.
(electrode is a kind of conductor)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for electrode that I've seen before include "Terminal of, eg, an acid battery" , "Conductor for electricity as it enters or leaves" , "Conductor by which current enters" , "Connecting conductor" , "Conductor making contact in a circuit" .)

I've seen this clue in The Independent.
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