Crossword Genius

Direct current is supplied by it (4)

Ross

I believe the answer is:

lead

This clue is a double definition.

'direct' is the first definition.
(synonyms)

'current is supplied by it' is the second definition.
(current might be supplied by a cable or lead)

(Other definitions for lead that I've seen before include "Guide, conduct" , "Command; metal" , "Go in front with heavy metal" , "1 down, symbol Pb" , "Go first" .)

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