Spout (3)
'spout' 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 "Hard black mineral or plane engine" , "Aircraft engine" , "Spurt; aircraft" , "Black gemstone" , "Hard black mineral used as gem" .)
'spout' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for squirt that I've seen before include "Force liquid out in a jet" , "Shoot liquid in a narrow jet" , "Force liquid out - short or contemptible person" , "Spirt" , "Short emission" .)