went on and on (6)
I believe the answer is:
lasted
'went on and on' is the definition.
(to last is to endure or go on)
This is all the clue.
(Other definitions for lasted that I've seen before include "Persisted, endured" , "Kept going" , "Endured, survived" , "Continued for some time, endured" , "Continued, being salted" .)