The most common and most likely answer to this crossword clue is the 9 letter word OLIGOPOLY
O
L
I
G
O
P
O
L
Y
Buddy explains!
The straight part
We know that "controlled market" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case controlled market = oligopoly.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 OLIGOPOLY mean?
OLIGOPOLY noun- An economic condition in which a small number of sellers exert control over the market of a commodity.