Dodgy type adds block for city (9)
I believe the answer is:
rotterdam
'for city' is the definition.
(Rotterdam is an example)
'dodgy type adds block' is the wordplay.
I cannot really understand how this works, but
'block' could be 'dam' (damming is a kind of blocking) and 'dam' is located in the answer.
The remaining letters 'rotter' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rotterdam that I've seen before include "Dutch city and port" , "European city" , "European port" , "One of the world's largest ports" , "city abroad" .)