Crossword Genius

City's fashionable past (7)

Ross

I believe the answer is:

chicago

Here is my best explanation:

'city's' is the definition.
(Chicago is an example)

'fashionable past' is the wordplay.
'fashionable' becomes 'chic' (I've seen this before).
'past' becomes 'ago' ('ago' can be similar in meaning to 'past').
'chic'+'ago'='CHICAGO'

This clue was last seen in The Independent