Related Clues:
- Sound of activity in university Her Majesty is going round
- A sign of business that is open to question
- Cat's sound of self-relaxation
- [I'm a happy cat]
- Contented cat's communication
- Happy tabby's sound
- Ideal engine sound
- Noise made by cat’s pursuer girl’s seen off
- Sound from a 91-Down
- What many air conditioners do
- Happy cats do this
- Sound of feline contentment
- (Belly rubs ... warm milk ... what a dream!)
- Sound of bee is sweet, but not bug
- Express pleasure in almost virtuous manner at last