Well bound (6)
I believe the answer is:
spring
I believe this is a double definition.
'well' is the first definition.
(a well is a spring of water)
'bound' is the second definition.
(both can mean to leap)
(Other definitions for spring that I've seen before include "Leap at a well-head" , "Vivaldi's work, in order(6;6;6;6)" , "Does the house out thoroughly" , "new dawn?" , "Leap; season" .)