The most common and most likely answer to this crossword clue is the 8 letter word TRIPTYCH
I've seen this crossword clue in The Daily Telegraph
T
R
I
P
T
Y
C
H
More clues leading to the result TRIPTYCH
- Thirty odd pieces of copy evolved into multi-faceted work
- Artwork seen in excursion to church on outskirts of Troy
- Stumble at second hearing of panel
- Tour tiny empty church, viewing work of art
- Stumble over fringes of tapestry and church’s painted panels
- After outing they emptied church altarpiece
- Journey terribly disheartened companion making set of panels
- Painting of fall with insect in the air
- Artistic representation of unfinished cryptic puzzles in The Hindu
- Visit tiny empty church, work of art
Buddy explains!

The straight part
We know that "painted panels" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case painted panels = triptych.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 TRIPTYCH mean?
TRIPTYCH noun- A picture or series of pictures painted on three tablets connected by hinges.
- A set of three se-tenant postage stamps that form a composite picture.