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Congrats SS and thanks Aristo. The first version of that clue used suburbs of Berlin, but then I thought Boston would be closer to you!

Well done, simplesimon - Carry On filth!

Thanks to aristo for the admin and for choosing a word full of possibilities.
I missed your request earlier, and will only add to ss's kind remarks that bourdon might also be used to describe the lowest sounding bell in a set; and so if those bells were all lined up, the bourdon might be the one on the, err, end . . .