It's potentially electrifying (4)
I believe the answer is:
'it's potentially electrifying' is the definition.
I can't judge whether this definition defines the answer.
'it's' is the wordplay.
I cannot quite see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
The remaining letters 'vol' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for volt that I've seen before include "Unit of electrical potential" , "Unit of electric force" , "Electrical SI unit named after a pioneering Italian physicist, d. 1827" , "Electricity unit" , "Electrical unit of measurement" .)