The most common and most likely answer to this crossword clue is the 9 letter word SCULPTURE
I've seen this crossword clue in The Daily Telegraph
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Buddy explains!
The straight part
We know that "A form of art" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a form of art = sculpture.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 SCULPTURE mean?
SCULPTURE noun- A three dimensional work of art created by shaping malleable objects and letting them harden or by chipping away pieces from a rock (sculpting).
- Works of art created by sculpting, as a group.
- The three-dimensional ornamentation on the outer surface of a shell
- To fashion something into a three-dimensional figure.
- To represent something in sculpture.
- To change the shape of a land feature by erosion etc.