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A certain degree of electrifying pressure (4)

Ross

I believe the answer is:

volt

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This might be a double definition.

'a certain degree' is the first definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'electrifying pressure' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'of' acts as a link.

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" , "A measure of electricity" , "Unit of electric force" , "Electricity unit" , "Unit of electric potential difference" .)

I've seen this clue in the Evening Standard.
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