Lawn watering device (9)

I believe the answer is:

sprinkler

'lawn watering device' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Times and The Guardian.

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