City is but a shell of London, after redevelopment (8)
I believe the answer is:
istanbul
'city' is the definition.
(Istanbul is an example)
'is but a shell of london after redevelopment' is the wordplay.
'shell of' means to remove the middle letters.
'after redevelopment' indicates anagramming the letters.
'london' with its centre removed is 'ln'.
'but'+'a'+'ln'='butaln'
'butaln' with letters rearranged gives 'tanbul'.
'is'+'tanbul'='ISTANBUL'
(Other definitions for istanbul that I've seen before include "Turkish port city" , "Catch the Latin bus out to Turkey" , "Former capital of Turkey, once Constantinople" , "Modern name of Constantinople" , "City in both Europe and Asia" .)