City with a Tory disaster (4)
I believe the answer is:
troy
'city' is the definition.
(Troy is an example)
'a tory disaster' is the wordplay.
'disaster' indicates anagramming the letters.
'tory' is an anagram of 'TROY'.
'with' acts as a link.
(Other definitions for troy that I've seen before include "Wooden horse siege city" , "Ancient beseiged city" , "System of weights used for precious metals" , "System of weights; ancient city in Turkey" , "Ancient city besieged by the Greeks" .)