Possible Clues:

• Sage pudding untouched?
• Canny type providing Pooter's dessert?
• One too shrewd to be tricked
• Pooter's sweet, but not a pushover!
• Too shrewd to be tricked
• Sage pudding presumably left uneaten
• Savvy individual
• Shrewd person (colloq.)
• Paul Newman film
• 1994 Paul Newman film