Related Clues:

• Luncheonette order, for short
• Mom's behavior warning
• Popular sandwich, for short
• Three-letter diner order
• Basic sandwich
• Brief diner order?
• Short order that often comes with toothpicks
• Barman gets tea with deli favourite
• Lunch menu letters
• Sandwich that's now a potato chip flavor
• Fitting exhortation to someone solving this puzzle?
• It's often a double-decker
• Tripart sandwich
• Noted three-ingredient sandwich
• It's about as old as the club