City bank getting a new key investment (7)
I believe the answer is:
tangier
'city' is the definition.
(city in Morocco)
'bank getting a new key investment' is the wordplay.
'bank' says to hollow out the word (remove centre letters) (I've seen 'banks of' mean this (the banks are the sides of the word)).
'getting' becomes 'taking' (taking is a kind of getting).
'a new key investment' becomes 'ier' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'taking' with its centre removed is 'tang'.
'tang'+'ier'='TANGIER'
Can you help me to learn more?
(Other definitions for tangier that I've seen before include "Moroccan seaport made of granite" , "North African seaport - granite (anag)" , "with a spicier taste?" , "More pungent" , "with more piquant flavour" .)