City stroll announced (4)
I believe the answer is:
rome
'city' is the definition.
(I know that Rome is a ancient city)
'stroll announced' is the wordplay.
'stroll' becomes 'roam' (I've seen this in another clue).
'announced' indicates a 'sounds like' (homophone) clue.
'roam' is a homophone of 'ROME'.
(Other definitions for rome that I've seen before include "Italian capital (where one Ac died)" , "The Eternal City" , "Seat of Italian empire" , "Capital of Italy" , "Where to emulate the locals" .)