The jump season? (6)
I believe the answer is:
spring
I believe this clue is a double definition.
'the jump' is the first definition.
(spring is a kind of jump)
'season' is the second definition.
(spring is a season)
(Other definitions for spring that I've seen before include "Bound < to start" , "Vivaldi's work, in order(6;6;6;6)" , "Flowering season of 7 dn" , "The bouncy season" , "Mechanical device" .)