Water jump? (6)
I believe the answer is:
spring
I believe this is a double definition.
'water' is the first definition.
(spring water is a kind of water)
'jump?' is the second definition.
(spring is a kind of jump)
(Other definitions for spring that I've seen before include "warp" , "Suddenly reveal" , "Leap; season" , "Leap, vault" , "early in the year" .)