Agreement to try tea break (6)
I believe the answer is:
treaty
'agreement' is the definition.
(I know that treaty is a type of agreement)
'try tea break' is the wordplay.
'break' is an anagram indicator.
'try'+'tea'='trytea'
'trytea' with letters rearranged gives 'TREATY'.
'to' is the link.
(Other definitions for treaty that I've seen before include "Formal pact" , "International agreement" , "Formal agreement between two or more countries" , "A pact between countries" , "alliance" .)