Possible Clues:

• Sound a warning, perhaps, when crossing street
• Warning sound
• He wilts (anag.)
• Signal when detailed cast list is included
• Time to grab extremely short pipe
• Game involving cards shown by the French referee's stand-by?
• This may be blown, although keeping silent on the outside
• Cockney's three-piece with half missing? Blow it!
• Pipe Len's half-finished after game of cards
• Hits Lew to make shrill sound