City of Helsinki evacuated (4)
I believe the answer is:
kiev
'city' is the definition.
(Kiev is an example)
'of helsinki evacuated' is the wordplay.
'of' indicates a hidden word.
'KIEV' is hidden within 'helsinki evacuated'.
(Other definitions for kiev that I've seen before include "Ukraine's largest city" , "Ukrainian city" , "FC Dynamo/chicken ___" , "Ukraine's capital - way of cooking chicken" , "Capital city of the Ukraine" .)