The most common and most likely answer to this crossword clue is the 12 letter word ENTREPRENEUR
I've seen this crossword clue in Financial Times
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Buddy explains!
The straight part
We know that "impresario" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case impresario = entrepreneur.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 ENTREPRENEUR mean?
ENTREPRENEUR noun- A person who organizes and operates a business venture and assumes much of the associated risk.
- A person who organizes a risky activity of any kind and acts substantially in the manner of a business entrepreneur.
- A person who strives for success and takes on risk by starting their own venture, service, etc.