The most common and most likely answer to this crossword clue is the 4 plus 6 letter word FREE MARKET
I've seen this crossword clue in The Guardian
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Buddy explains!
The straight part
We know that "capitalist system /capitalist system" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case capitalist system /capitalist system = free market.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 FREE MARKET mean?
FREE MARKET adjective- Of, related to or characteristic of a free market. Lacking wealth redistribution and government regulation.