Biscayne Bay city (5)
I believe the answer is:
miami
'biscayne bay city' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for miami that I've seen before include "US city" , "tourist centre" , "Sunshine city in SE Florida" , "Resort city in SE Florida" , "Prejudice in favour of one person or thing" .)