Contributor to the pressure behind a current movement (4)
I believe the answer is:
volt
'pressure behind a current movement' is the definition.
I can't tell whether this definition defines the answer.
'contributor to the' is the wordplay.
'contributor to' becomes 'vol' (I can't explain this - if you can you should believe this answer much more).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'vol'+'t'='VOLT'
Can you help me to learn more?
(Other definitions for volt that I've seen before include "SI unit of electromotive force" , "A measure of electricity" , "Unit of electric potential difference" , "Electrical unit of measurement" , "Unit of electric force" .)