DC current (7)

I believe the answer is:

potomac

'dc current' is the definition.
(river flowing through Washington DC)

This is all the clue.

(Other definitions for potomac that I've seen before include "River of Washington DC" , "Capital outflow" , "Water flowing" , "Flower" , "to which banks in Washington have access" .)

I've seen this clue in The Guardian.

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