Handle last bit of wordy agreement (6)
I believe the answer is:
treaty
'agreement' is the definition.
(treaty is a kind of agreement)
'handle last bit of wordy' is the wordplay.
'handle' becomes 'treat' ('treat' can be a synonym of 'handle').
'last bit of' indicates one should take the final letters.
The last letter of 'wordy' is 'y'.
'treat'+'y'='TREATY'
(Other definitions for treaty that I've seen before include "Political or private agreement" , "Formal agreement between governments" , "A pact between countries" , "Pact, accord between states" , "Formal agreement between two or more countries" .)