Do vote, but not "Yes” (5)
I believe the answer is:
beano
'do vote' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'but not yes' is the wordplay.
'but' becomes 'bea' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'not yes' becomes 'no'.
'bea'+'no'='BEANO'
Can you help me to learn more?
(Other definitions for beano that I've seen before include "A bone for a feast" , "Comic and informal get-together" , "Junket - children's comic" , "Function" , "Comic - party" .)