Related Clues:

• Barmy joke, third in cracker
• A crack up leaves one not right in the head
• Demented, with a crack on the head
• Giddy-brained
• Smitten to the max
• Lady __
• Wildly enthusiastic
• Pop superstar, for short
• 'Born This Way' singer, familiarly
• Lady singer with good range
• Grand military official's losing it
• Excessively avid
• Infatuated, informally
• Nuts choke American
• Backward? That's a joke! Deranged!