Relationship ends (5)
I believe the answer is:
terms
I believe this is a double definition.
'relationship' is the first definition.
(eg terms of a business relationship)
'ends' is the second definition.
(term can mean the end of something)
(Other definitions for terms that I've seen before include "Opportunities to study" , "Conditions; charge" , "Work periods" , "Stipulations, often joined to conditions" , "when schools should be open" .)