Former leader emerging from Korea gang (6)
I believe the answer is:
reagan
'former leader' is the definition.
(I've seen this before)
'from korea gang' is the wordplay.
'from' indicates the answer is hidden within the clue.
'REAGAN' can be found hidden inside 'korea gang'.
'emerging' is the link.
(Other definitions for reagan that I've seen before include "40th US president, Ronald" , "Former US president" , "Ronald ...... ex-American president" , "Western star" , "40th US president, d. 2004" .)