Related Clues:

• Finked
• Competed on ''American Idol''
• Rendered a ballad
• Used one's pipes
• Ratted to the fuzz
• Trolled
• Performed ballads, e.g.
• Showed disloyalty
• Auditioned for 'American Idol'
• Emulated a canary
• Emulated a rat
• Provided backup, perhaps
• Was a ratfink
• Aired out one's pipes
• Squealed, so to speak