Yes, I suggested MarbleArch something (platform?) on the other thread (which has now gone) because of the arch/roguish link.
I wondered if OP had conflated two clues but the second thread was the same.
'I'm sorry I haven't a clue' is Mornington Crescent , the next clue in the quiz!! Thank you for all your help but we are not quite there . Maybe the compiler is wrong !!
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