Obliged to make one jump (5)
I believe the answer is:
bound
This clue is a double definition.
'obliged to' is the first definition.
(thesaurus)
'one jump' is the second definition.
(bound is a kind of jump)
'make' is the link.
(Other definitions for bound that I've seen before include "Tied - leap" , "border" , "demarcation" , "Bob < sure < to be heading for" , "Confined" .)