Possible Clues:

• That's it for a new-sounding start
• That's it for the tune with 'er
• Like 'das Kapital'
• Is there e'er a nut for it?
• That's it! Sounds amphibious
• Retune this? That's it
• Cases for neuroscience unit emergency room doctor
• Render unproductive?
• Spay counterpart
• Like some Latin nouns