Possible Clues:

• He fee line, by the sound of it
• The Rum Tum Tugger, e.g.
• He might have a beastly coma with a teetotaller around
• Take away his coat and he might sound empty
• Take his coat away and what's left might sound empty
• Domestic male feline
• Male moggie
• F-14, e.g.
• Prowler in alley begins letter for master of ceremonies ¿ that's flipping gratitude
• By the sound of it, his is the fee online