Break down (7)
'break down' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for founder that I've seen before include "One sets up firm" , "Creator" , "One who makes an institution" , "Institution's former" , "Capsize, being an originator" .)
(Another definition for go bung that I've seen is " fail down under".)
'break down' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dismantle that I've seen before include "Unrig" , "Strip down" , "Take to bits" , "Pull to pieces" , "Undo" .)