Fuss about one concreting over major city (7)
I believe the answer is:
palaver
'fuss' is the definition.
(both can mean a commotion)
'one concreting over major city' is the wordplay.
'one concreting' becomes 'paver' (I am not sure about this - if you are sure you should believe this answer much more).
'over' means one lot of letters goes inside another.
'major city' becomes 'LA' (Los Angeles).
'paver' placed around 'la' is 'PALAVER'.
'about' acts as a link.
Can you help me to learn more?
(Other definitions for palaver that I've seen before include "'Flattery, empty talk (7)'" , "Confused talk and activity" , "Commotion" , "Long tedious fuss" , "Rigmarole" .)