Possible Clues:

• Sound of difficult breathing
• Breathe hoarsely in jolly jape
• The plan is to sound cold
• This asthmatic may have a cunning plan
• Hoarse breathing sound, or a clever trick
• Clever scheme produces audible expressions of excitement
• Stratagem that's sound betraying one struggling for inspiration?
• Dodge unknown end of ride after yell from roller coaster?
• Cunning plan (informal)
• Whistling breath