Pocket purse (3)
I believe the answer is:
This clue is a double definition.
'pocket' is the first definition.
(as in to pot or pocket a ball in snooker)
'purse' is the second definition.
(both can mean a fund)
(Other definitions for pot that I've seen before include "Weed" , "Cooking utensil or illegal drug" , "Slangy cannabis" , "Street name for cannabis" , "Trophy; kitty" .)