Possible Clues:

• Dated old sucker is not a hard nut reportedly
• Breath-sweetener is something nutty, we hear
• Pill or lozenge used to sweeten one�s breath
• Scented lozenge to sweeten the breath
• By the sound of it, money - Ooh, for a sucker!
• It takes such a sucker to keep the breather sweet
• Have a nice breath of money - Ooh! that's what it sounds like