Related Clues:

• Fizzling firecracker
• It never goes off
• Thing that fails to work
• Box office bomb
• The occasional firework
• Firework not seen going up? On the contrary!
• Like my idea for an app that's just a picture of a potato
• Box office flop
• Useless (informal)
• Whatever way you look at it, Duff amounts to a failure
• Thing that didn't go off
• Defective cherry bomb
• Firecracker that goes pfft
• Lemon or turkey
• 'Turkey'