Crossword Genius

Dashing person has known lady primarily for the time that dampens fire (9)

Ross

I believe the answer is:

sprinkler

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'that dampens fire' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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

I've seen this clue in The Daily Express.
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