Chat idly about voting system with former PM endlessly (7)
I believe the answer is:
prattle
'chat' is the definition.
(thesaurus)
'idly about voting system with former pm endlessly' is the wordplay.
'idly about voting system' becomes 'pr' (I can't justify this - if you can you should give a lot more credence to this answer).
'with' means one lot of letters go next to another.
'former pm' becomes 'Attlee' (prime minister Clement Attlee).
'endlessly' means to remove the last letter.
'attlee' with its last letter removed is 'attle'.
'pr'+'attle'='PRATTLE'
Can you help me to learn more?
(Other definitions for prattle that I've seen before include "Chatter in childish way" , "Blether" , "Inconsequential chatter" , "Be vapidly garrulous" , "Talk inconsequentially" .)