Heads of all states in African continent (4)
I believe the answer is:
asia
'continent' is the definition.
(Asia is an example)
'heads of all states in african' is the wordplay.
'heads of' indicates taking the first letters.
The initial letters of 'all states in african' is 'ASIA'.
(Other definitions for asia that I've seen before include "lands in the east" , "Major land mass" , "its pampered jades couldn't draw much?" , "Large area" , "group of countries" .)