Possible Clues:

• Source of money shortly provides pleasure
• Crosswords, say
• "Ain't We Got ___?"
• Clowning
• One might enjoy being so mouldy with a gal
• Fooling around
• Word in a Cyndi Lauper tune title
• Gus might have such entertainment with this in a mouldy sort of way
• However enjoyable, that's enough to have made Gus mouldy
• ''Girls Just Want to Have ---''