City in a whirl (7)
I believe the answer is:
chicago
'city in a whirl' is the definition.
'Chicago' can be an answer for 'city' (Chicago is an example). I'm not sure about the 'in a whirl' bit.
'city in a whirl' is the wordplay.
'city in' becomes 'chica' (I am not sure about this - if you are sure you should believe this answer much more).
'a whirl' becomes 'go' (synonyms).
'chica'+'go'='CHICAGO'
Can you help me to learn more?
(Other definitions for chicago that I've seen before include "City on Lake Michigan" , "A Windy City in Illinois" , "3 city in the US" , "American city; musical" , "Port on Lake Michigan" .)