Leaders in Israel did address head of state (5)
I believe the answer is:
idaho
'state' is the definition.
(US state)
'leaders in israel did address head of' is the wordplay.
'leaders in' suggests taking the first letters.
'of' becomes 'o''.
The first letters of 'israel did address head' is 'idah'.
'idah'+'o'='IDAHO'
(Other definitions for idaho that I've seen before include "Pertaining to the Bard" , "US state, capital Boise" , "US state E. of Oregon" , "agricultural land" , "The Gem State, known for its potatoes" .)