The city of Tammany Hall (5)
I believe the answer is:
amman
'the city' is the definition.
(Amman is an example)
'of tammany hall' is the wordplay.
'of' indicates a hidden word.
'AMMAN' is hidden in the letters of 'tammany hall'.
(Other definitions for amman that I've seen before include "Jordanian city" , "City of Jordan" , "Jordan's capital" , "A capital f-fellow in Jordan?" , "Jordanian capital" .)