CIA messed about with Castro's country (5,4)
I believe the answer is:
costa rica
'country' is the definition.
(Costa Rica is an example)
'cia messed about with castro's' is the wordplay.
'messed about with' indicates anagramming the letters.
'cia' with its letters anagrammed with 'castro' makes 'COSTA-RICA'.
(Other definitions for costa rica that I've seen before include "place in Central America" , "source of coffee" , "Central American republic" , "international team?" , "Central American country, capital San Jose" .)