Related Clues:
- Snake's noise
- Worrisome sound for a balloonist
- Unwelcome reception
- Sibilant threat
- Sound of displeasure
- *Let off some steam?
- Indication of deflation
- Sibilant sound of disapproval
- S-sound of disapproval
- Make sibilant sound like snake
- Make sibilant sound of disapproval
- Make sibilant sound of disapproval as at villain
- Sibilant sound as of snake
- Make sibilant sound
- How 17 across gets to the south with derision, by the sound of it