Lawn watering device (9)
I believe the answer is:
sprinkler
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lawn watering device</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)