The Crossword Centre Clue-Writing Competition

CCCWC September competition voters’ comments
 
Clue no. 57: Top Roman capital guide taking tour round centre of Trevi?

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A clue to CICERONE.
1 comment refers to this clue (from 1 competitor, 0 others)

Here is the text

Comments on the clue
1.There seems to be a misprint in the explanation, but I still can't see where "one" comes from