One of the Jackson brothers (4)
I believe the answer is:
tito
'one of the jackson brothers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tito that I've seen before include "Marshall ..., President of Yugoslavia from 1953" , "Yugoslav marshal" , "Former Yugoslav leader" , "Josip Broz, d. 1980" , "Yugoslav marshall, prime minister and president, d. 1980" .)