Heads of State attending conference kindled fire (4)
I believe the answer is:
sack
'fire' is the definition.
(dismiss someone from their job)
'heads of state attending conference kindled' is the wordplay.
'heads of' indicates taking the first letters.
The first letters of 'state attending conference kindled' is 'SACK'.
(Other definitions for sack that I've seen before include "Dismiss; plunder; wine" , "Dismiss; an old wine" , "Fire - rifle" , "Devastate" , "Plunder - large bag" .)