Fidel's amigo (3)
I believe the answer is:
che
'fidel's amigo' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for che that I've seen before include "Fighter" , "- Guevara, Marxist" , "First person" , "- Guevara, guerrilla" , "Nickname of Ernesto Guevara" .)