Fidel's friend given radical cigar (7)
I believe the answer is:
cheroot
'cigar' is the definition.
(cheroot is a kind of cigar)
'fidel's friend given radical' is the wordplay.
'fidel's friend' becomes 'che' (I've seen this in another clue).
'given' says to put letters next to each other.
'radical' becomes 'root' (synonyms).
'che'+'root'='CHEROOT'
(Other definitions for cheroot that I've seen before include "Havana?" , "16 21 [INDIAN IMPORT]" , "'Cigar, square at both ends (7)'" , "Cigar cut at both ends" , "Cigar with open ends - hot core (anag)" .)