A fortune in zlotys (3)
I believe the answer is:
lot
'a fortune' is the definition.
('lot' can be a synonym of 'fortune')
'in zlotys' is the wordplay.
'in' indicates a hidden word.
'LOT' is hidden in the letters of 'zlotys'.
(Other definitions for lot that I've seen before include "Group of auction items" , "shower" , "Large amount; Abraham's nephew" , "crowd ..." , "Portion in life" .)