Possible Clues:

• As is, the street is stagnating
• Sounds like the way to tell your little sister not to go and get stagnant like this
• Assist in state of stagnation
• This will 20 down if you don't go, sister, by the sound of it
• One of the family sat up during the stoppage
• By the sound of it, don't go for this sort of stagnation, Sister
• Secret police's arrest
• 'Little sister, don't go, by the sound of it, and be in stagnation (6)'
• Way a sun exists in a constant state
• Inactivity extremely self-evident in existing state of affairs