Related Clues:

• That is it
• Does this sound more amphibious? That's it!
• That's it for a new-sounding start
• Like it?
• That's it for the tune with 'er
• Is there e'er a nut for it?
• That's it! Sounds amphibious
• Retune this? That's it
• That's it - more like something in water
• Grammatical gender
• Render unproductive?
• Disgust makes sodium turn to salt
• Non-21 description of Livingstone, say?
• Sexless
• De-sex