Tied up in spring (5)
I believe the answer is:
bound
This clue is a double definition.
'tied up' is the first definition.
('bind' can be a synonym of 'tie up')
'spring' is the second definition.
(both can mean to jump)
'in' is the link.
(Other definitions for bound that I've seen before include "long jump" , "Tied - leap" , "demarcation" , "Bob < sure < to be heading for" , "Tied -- limit" .)