Hot tub nozzle (3)
I believe the answer is:
jet
'hot tub nozzle' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for jet that I've seen before include "A spring in ballet" , "Spurt of water or fast plane" , "Rush" , "Hard black mineral used as gem" , "Type of plane" .)