Possible Clues:

• What you get in riot? It can make you cry
• Riot control substance
• Means of quelling riots that's enough to make even tough guys weep
• What's potentially great as crowd controller
• Mob disperser
• What may quell riot when rent's nearly doubled
• Riotously, it's enough to make you weep
• Prepare to contain Indian city's uprising - with this?
• Great moves when used for riot control
• Hurry and talk: this may stop a riot