The most common and most likely answer to this crossword clue is the 7 letter word DIORAMA
I've seen this crossword clue in The Times
D
I
O
R
A
M
A
More clues leading to the result DIORAMA
- Moon appearing in play's miniature scene
- 3-D depiction of moon in play
- Model set to portray one of Zeus’s lovers in play?
- Scene designer, a graduate of the arts faculty?
- Scene in play about Greek maiden
- Small scene in play is Iago’s first and last
- Three-dimensional scene Ivor regularly included in play
- Small scene in play about Coeur de Lion?
- Miniature scene from play in which moon appears
- Model I love in performance
Buddy explains!

The straight part
We know that "Three-dimensional scene" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case three-dimensional scene = diorama.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 DIORAMA mean?
DIORAMA noun- A three-dimensional display of a scenery, often having a painted background in front of which models are arranged, e.g. in a museum where stuffed animals are presented against a painted landscape.