State leaders in Oval Office receive greeting (4)
I believe the answer is:
ohio
'state' is the definition.
(Ohio is an example)
'leaders in oval office receive greeting' is the wordplay.
'leaders in' says to take the initial letters.
'receive' indicates putting letters inside.
'greeting' becomes 'hi' (hi is a kind of greeting).
The initial letters of 'oval office' is 'oo'.
'oo' enclosing 'hi' is 'OHIO'.
(Other definitions for ohio that I've seen before include "American river" , "E. central US state" , "part of the Midwest!" , "One of the American states" , "American state, capital Columbus" .)