The most common and most likely answer to this crossword clue is the 7 letter word COLLAGE
I've seen this crossword clue in Financial Times
C
O
L
L
A
G
E
More clues leading to the result COLLAGE
- Picture educational establishment with area for English
- Artwork, huge, lacking centrepiece: pass over that
- Company with unfortunate legal picture
- Picture educational establishment with convict for member
- Firm lines with mature artwork
- Place for student, American not English, to produce artwork
- Neck beer, having run off to make artwork
- Artwork featuring headless parrot inside wire bars
- He ran many a mile filled with bitterness over a paste up job
- Artwork by army officer and student taking a long time
Buddy explains!

The straight part
We know that "artwork" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case artwork = collage.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 COLLAGE mean?
COLLAGE noun- A picture made by sticking other pictures onto a surface.
- A composite object or collection (abstract or concrete) created by the assemblage of various media; especially for a work of art such as text, film, etc.
- The technique of producing a work of art of this kind.
- To make into a collage.