The most common and most likely answer to this crossword clue is the 3 letter word JUN
J
U
N
Buddy explains!
The straight part
We know that "change in N Korea" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case change in n korea = jun.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does JUN mean?
JUN noun- A monetary unit of North Korea and formerly of South Korea, equal to one hundredth of a won.