Walk to go on and on? (6)
I believe the answer is:
ramble
I believe this clue is a double definition.
'walk' is the first definition.
(ramble is a kind of walk)
'go on and on?' is the second definition.
'to' acts as a link.
(Other definitions for ramble that I've seen before include "Walk for pleasure or stray from subject" , "Show incoherence" , "Walk or wander" , "Walk; be discursive" , "Walk for pleasure or talk confusingly" .)