Good evening, Rusty!
I think a "bandwagon" is just as it sounds?
A wagon, brightly coloured, for carrying the band in a parade?
Surprisingly , Brewers (my edition, anyway) does not have any info about "jump on the bandwagon".
I know, of course, what the expression means, but was wondering how it originated?
I have managed to do one of my three remaining clues......
I was stuck for ages on 7d., thinking that LSD referred to the drug!
It does of course mean pounds , shillings and pence - librae, solidi, denarii.
I can't believe how long that took me!
Just two clues left now, but they are interlocking....23d and 26a.......