Drunken Mr Beal to go on and on (6)
I believe the answer is:
ramble
'go on and on' is the definition.
(I've seen this in another clue)
'drunken mr beal' is the wordplay.
'drunken' indicates an anagram.
'mr'+'beal'='mrbeal'
'mrbeal' with letters rearranged gives 'RAMBLE'.
'to' acts as a link.
(Other definitions for ramble that I've seen before include "Go as fancy leads" , "Show incoherence" , "Walk as leisure activity" , "Roam about" , "Leisurely walk" .)