Leaders should attend meeting on agriculture in island nation (5)
I believe the answer is:
samoa
'island nation' is the definition.
(country made up of several islands)
'leaders should attend meeting on agriculture' is the wordplay.
'leaders' suggests taking the first letters.
The first letters of 'should attend meeting on agriculture' is 'SAMOA'.
'in' acts as a link.
(Other definitions for samoa that I've seen before include "Group of islands in the South Pacific" , "Commonwealth country in the Pacific, capital Apia" , "Group of Polynesian 14s" , "Pacific island nation, capital Apia" , "Group of volcanic islands in the S Pacific" .)