Possible Clues:

• Race to drop back when this is fired?
• There's a great explosion, as it disperses the crowd
• Rages at new riot control measure
• Anti-riot chemical
• It's possibly great when it's used for riot control
• Charge to have a good time — it makes you cry!
• Wear a mask for this
• Only one of two rents reduced? Irritating stuff
• Let rip on accelerator -- that'll clear the road!
• Riot deterrent (2 words)