Leaders of Middle East territory came together (3)
I believe the answer is:
met
'came together' is the definition.
(meeting is a kind of coming together)
'leaders of middle east territory' is the wordplay.
'leaders of' suggests taking the first letters.
The initial letters of 'middle east territory' is 'MET'.
(Other definitions for met that I've seen before include "Encountered by chance or arrangement" , "Came across - police in London" , "Made a connection" , "Got together" , "Encountered pro tem" .)