Related Clues:

• It purrs when it's cared for
• Purring one
• Sylvester, e.g.
• Milk lover
• Purring animal
• Common house pet
• Tabby or tom
• Seuss' hat-wearer
• Purring 40 Down
• Casey Jones' spot
• Mouse hunter
• Pistons' home?
• Whip with nine tails
• It converts energy to motion
• Mechanical device as source of power