Related Clues:

• Earn an F
• Nasty smell
• By the sound of it, it's sent not to be nice
• Be utterly awful
• Pong
• Fail an exam (in the US)
• Smell — great fuss caused
• Perform awfully
• Play really poorly
• Do badly
• Smell nasty
• Fuss resulting when sweaters are back to front
• Hum a song and dance
• Terrible smell
• Fail to get a passing grade