Demonstrating control? (4,3)
I believe the answer is:
tear gas
'control?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for tear gas that I've seen before include "Blinding vapour used to subdue" , "Riot control agent" , "Riot police may use this eye irritant" , "Police weapon" , "Riot control substance" .)