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Craving magnetic core, electrified on edges (4)

Ross

I believe the answer is:

need

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'craving' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for need that I've seen before include "destitute state" , "''A friend in .... is a friend indeed''" , "Rely on" , "Lack - demand" , "Exigency" .)

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