Money ( Informal ) (5)
(Other definitions for lucre that I've seen before include "ill-gotten gains" , "Cash" , "financial gain" , "Bread, dough, lolly" , "Scornful word for money that may be 1 Across" .)
(Other definitions for lolly that I've seen before include "Money; sweet on a stick" , "dough" , "Money (informal)" , "sticky sweet" , "Cash (slang)" .)