Related Clues:

• Schwa's cousin
• Vowel sound in 'puzzle'
• Bug's midsection
• 'Dumb' vowel sound
• Thumb's middle?
• Vowel sound in 'run'
• There's one in 'puzzle'
• Sound in the middle of drums
• Puzzling sound?
• Ultra sound?
• Vowel sound in "bug"
• Drum sound?
• Sound in ''puzzle''
• Beginning to understand?
• Upfront?