Scheme to get money in the kitty (4)
I believe the answer is:
plot
'scheme' is the definition.
(plot is a kind of scheme)
'money in the kitty' is the wordplay.
'money' becomes 'l' (L can mean 'pounds').
'in the' indicates putting letters inside.
'kitty' becomes 'pot' ('pot' can be a synonym of 'kitty').
'l' put into 'pot' is 'PLOT'.
'to get' acts as a link.
(Other definitions for plot that I've seen before include "A scheme, or a parcel of land" , "Patch of ground" , "garden area" , "Connive" , "Chart - area" .)