The Crossword Centre Clue-Writing Competition

CCCWC August competition voters’ comments
 
Clue no. 3: Bygone cities sharing river border and square city walls (9)

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

Here is the text

Comments on the clue
1.Clever wordplay but I’m struggling to see bygone as a definition (adjective v noun)