Crossword Genius

Just one is not very electrifying (4)

Ross

I believe the answer is:

volt

I'm a little stuck... Click here to teach me more about this clue!

'just one' is the definition.
The answer and definition can be both quantities as well as being singular nouns.
Maybe you can see an association between them that I don't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for volt that I've seen before include "Electrical SI unit named after a pioneering Italian physicist, d. 1827" , "SI unit of electromotive force" , "Unit of electric force" , "Electricity unit" , "Electrical unit of measurement" .)

I've seen this clue in the Evening Standard.
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