The most common and most likely answer to this crossword clue is the 5 letter word SECCO
I've seen this crossword clue in The Daily Telegraph
S
E
C
C
O
More clues leading to the result SECCO
Buddy explains!

The straight part
We know that "Painting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case painting = secco.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 SECCO mean?
SECCO noun- A work painted on dry plaster, as distinguished from a fresco.
- Dry
- Dry – sparse accompaniment, staccato, without resonance