City where some say the underworld's very dark? (8)
I believe the answer is:
helsinki
'city' is the definition.
(Helsinki is an example)
'some say the underworld's very dark?' is the wordplay.
I cannot really see how this works, but
'underworld's' could be 'hels' (underworld in Norse mythology) and 'hels' is located in the answer.
This explanation may well be incorrect...
'where' is the link.
Can you help me to learn more?
(Other definitions for helsinki that I've seen before include "Main city of Finland" , "Foreign city" , "Capital of Finland" , "Finland's capital" , "port" .)