Jacuzzi spray (3)
I believe the answer is:
jet
'jacuzzi spray' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for jet that I've seen before include "Spurt of water or fast plane" , "Narrow spouting stream" , "Jumbo plane?" , "Sort of black" , "The blackest black" .)