Related Clues:

• Kitten's call
• Corporate flunky
• Sound of tires on the highway
• Annoying sound
• Contented sound
• Machine sound
• Sonar pulse
• Contented tabby sound
• Make music, in a way
• Cat's 'please continue scratching behind my ears'
• Run perfectly
• Male bee
• Kittenish sound
• Military reconnaissance tool
• Sing, in a way