The most common and most likely answer to this crossword clue is the 9 letter word COMMUNISM
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More clues leading to the result COMMUNISM
Buddy explains!

The straight part
We know that "New political system" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case new political system = communism.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 COMMUNISM mean?
COMMUNISM noun- Any political ideology or philosophy advocating holding the production of resources collectively.
- Any political social system that implements a communist political philosophy.
- The international socialist society where classes, money, and the state no longer exist.