Craving magnetic core, electrified on edges (4)
I believe the answer is:
need
'craving' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for need that I've seen before include "destitute state" , "''A friend in .... is a friend indeed''" , "Rely on" , "Lack - demand" , "Exigency" .)