The most common and most likely answer to this crossword clue is the 10 letter word IMPRESARIO
I've seen this crossword clue in The Times
I
M
P
R
E
S
A
R
I
O
More clues leading to the result IMPRESARIO
- Paris and Rome arranged by international producer
- Shanghai almost needs a port manager
- One Mr Opera is replaced as concert master
- I promise somehow to engage upcoming artist?
- Theatre manager with prime positioning above dress circle
- One is 'Mr Opera' possibly?
- Who might stage Iris, Mascagni’s foremost opera, possibly
- Being a showman, this person’s flaunting spare port
- Promise air conditioning for showman
- Company director – one involved with Paris and Rome
Buddy explains!

The straight part
We know that "I promise somehow to engage upcoming artist?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case i promise somehow to engage upcoming artist? = impresario.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 IMPRESARIO mean?
IMPRESARIO noun- A manager or producer in the entertainment industry, especially music or theatre.