Jump well (6)
I believe the answer is:
spring
I believe this clue is a double definition.
'jump' is the first definition.
(I know that spring is a type of jump)
'well' is the second definition.
(a well is a spring of water)
(Other definitions for spring that I've seen before include "Bound into the season" , "Pounce -- pogo stick part" , "new dawn?" , "Start season" , "Source of water" .)