The most common and most likely answer to this crossword clue is the 9 letter word CANALETTO
I've seen this crossword clue in The Daily Telegraph
C
A
N
A
L
E
T
T
O
More clues leading to the result CANALETTO
- Artist, one allowed to share highest choral part
- He painted lines without a permit
- Doctor lent a coat to artist
- Famous Venetian on a cattle round-up
- Prison first allowed to painter
- Put an end to lease that’s given to painter
- It’s a grand sight in Venice and in France to this artist
- Prison’s a hindrance to an artist
- Painter of cattle on a spread
- Preserve a form of service in honour of noted artist
Buddy explains!

The straight part
We know that "Painter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case painter = canaletto.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.