Maxim, a banker in Zurich? (5)
I believe the answer is:
gnome
This clue is a double definition.
'maxim' is the first definition.
(I know that gnome is a type of maxim)
'a banker in zurich?' is the second definition.
(the gnomes of Zurich is a term for Swiss bankers)
(Other definitions for gnome that I've seen before include "international banker" , "Saw" , "Dwarfish creature; garden ornament" , "Swiss financier" , "Legendary creature" .)