From The Enigma
NPL Magazine - Dec. 2011
JOKER (adapted)

A countesses lost her count
Quite some time ago.
She also lost a fortune as
She  squandered all his dough.
"I   _ _   _ _ _ _ ," she admitted,
"In fact, I can't say no - 
Blackjack, poker, and baccarat, 
Those cards have been my woe."

Answer:

DO WAGER  (DOWAGER)