A ____ system for fire prevention was installed in London's Theatre Royal in 1812 (9)

I believe the answer is:

sprinkler

(Other definitions for sprinkler that I've seen before include "Lawn waterer" , "that dampens fire" , "Lawn watering device" , "Device attached to a garden hose for watering" , "Fire extinguisher" .)

I've seen this clue in The Times.

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