This person's returned twice to tour a city (5)
I believe the answer is:
miami
'city' is the definition.
(Miami is an example)
'this person's returned twice to tour a' is the wordplay.
'this person's' becomes 'im' (this person means the crossword setter themselves).
'returned' is a reversal indicator.
'twice' shows that letters should be duplicated.
'to tour' indicates putting letters inside (to tour can mean to go around).
'im' written backwards gives 'mi'.
'mi' doubled is 'mimi'.
'mimi' going around 'a' is 'MIAMI'.
(Other definitions for miami that I've seen before include "Resort city in SE Florida" , "Port in Florida" , "Popular city in SE Florida" , "Florida resort city, Beach" , "place associated with vice?" .)