Heroic tale from South Africa about a guerrilla leader (4)
I believe the answer is:
saga
'heroic tale' is the definition.
(saga is a kind of heroic tale)
'south africa about a guerrilla leader' is the wordplay.
'south africa' becomes 'sa' (abbreviation).
'about' says the letters should be written in reverse.
'leader' indicates taking the first letters.
The first letter of 'guerrilla' is 'g'.
'a'+'g'='ag'
'ag' reversed gives 'ga'.
'sa'+'ga'='SAGA'
'from' acts as a link.
(Other definitions for saga that I've seen before include "Icelandic or Norse story" , "Long heroic, family, story" , "long series of events" , "Account of great heroism" , "Epic story" .)