Chap is advised about city (4)
I believe the answer is:
pisa
'city' is the definition.
(Pisa is an example)
'chap is advised about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'PISA' is hidden within 'chap is advised'.
(Other definitions for pisa that I've seen before include "listed building site" , "City on the River Arno" , "Tuscan city" , "There's a marked inclination here" , "Italian city with famous tower" .)