Agreement to try tea break (6)
I believe the answer is:
treaty
'agreement' is the definition.
(treaty is a kind of agreement)
'try tea break' is the wordplay.
'break' indicates anagramming the letters.
'try'+'tea'='trytea'
'trytea' anagrammed gives 'TREATY'.
'to' acts as a 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" .)