Out of sorts, accused up-and-coming left-winger (6)
I believe the answer is:
castro
'left-winger' is the definition.
(Fidel Castro, former Cuban leader)
'out of sorts accused up-and-coming' is the wordplay.
'out of' indicates a hidden word.
'up-and-coming' shows that the letters should be reversed in order.
'ortsac' can be found hidden inside 'sorts accused'.
'ortsac' back-to-front is 'CASTRO'.
(Other definitions for castro that I've seen before include "Cuba's chief Fidel" , "Latin-American presidential co-star" , "He's late" , "Latin American dictator" , "Fidel ......, Cuban chief" .)