Green’s Dictionary of Slang

(UK Und.) money.

1865		Leaves from Diary of Celebrated Burglar 70/1: She kept her ‘stocking’ in one of a pair of large saddle bag ‘kicks’ under her petticoat, and when taking her seat would hitch the ‘kick’ in which the ‘sugar’ was kept under her hip.
1968		J. Healy Death of an Irish Town 63: Yes, many of that 32,000 may have ‘the stocking’ in the bank.
2003		H. Hill A Good Fella’s Guide To N.Y. 123: Candy, markers, ammo, liners, stocking stuffer, sweetener, garnish, and pledges are all terms for cash.