Crowd disperser (4,3)

I think it could be either:

Which length description are you looking for?:

4,3

tear gas

'crowd disperser' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for tear gas that I've seen before include "Riot control means" , "Riot control weapon" , "Riot control agent" , "'It can be used to disperse crowds (4,3)'" , "Airlike substance that irritates the eyes, used in riots" .)

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