Word after "water" or "jet" (3)
I believe the answer is:
ski
'word after water or jet' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ski that I've seen before include "Hit the slopes" , "Narrow runner built for travel in snow" , "Sliding runner" , "Alpine runner" , "Narrow runner for snow and water" .)