The fisherman's bringing up food for the city (5,10)
I believe the answer is:
saint petersburg
'city' is the definition.
(Saint Petersburg is an example)
'the fisherman's bringing up food' is the wordplay.
'the fisherman's' becomes 'SaintPeters' (the apostle was an example).
'bringing up' says the letters should be written in reverse (I've seen 'bring up' mean this).
'food' becomes 'grub' (grub is a kind of food).
'grub' written backwards gives 'burg'.
'saintpeters'+'burg'='SAINT PETERSBURG'
'for the' acts as a link.
(Other definitions for saint petersburg that I've seen before include "capital no longer" , "former capital" , "[TSAR] would call this home" , "city" .)