River providing one with a unit of electricity (5)

I believe the answer is:

volta

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'river' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

'one with a unit of electricity' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'with' says to put letters next to each other.
'a unit of electricity' becomes 'volt' (I've seen this in another clue).
'a' after 'volt' is 'VOLTA'.

'providing' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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