The most common and most likely answer to this crossword clue is the 6 letter word SCENES
I've seen this crossword clue in Financial Times
S
C
E
N
E
S
More clues leading to the result SCENES
- Act parts with fierceness partially rewritten
- Angry outbursts in play
- Roman dramatist’s cutting one up for parts of his work?
- Special educational needs involving constant and regularly messy episodes
- Actor’s time on stage makes sense, snorting cocaine
- Dramatic divisions?
- One about to leave studies for small parts in plays
- Prospects of, reportedly, spotted owls finally
Buddy explains!

The straight part
We know that "Act parts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case act parts = scenes.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 SCENES mean?
SCENES noun- The location of an event that attracts attention.
- The stage.
- The decorations; furnishings and backgrounds of a stage, representing the place in which the action of a play is set
- A part of a dramatic work that is set in the same place or time. In the theatre, generally a number of scenes constitute an act.
- The location, time, circumstances, etc., in which something occurs, or in which the action of a story, play, or the like, is set up
- A combination of objects or events in view or happening at a given moment at a particular place.
- A landscape, or part of a landscape; scenery.
- An exhibition of passionate or strong feeling before others, creating embarrassment or disruption; often, an artificial or affected action, or course of action, done for effect; a theatrical display
- An element of fiction writing.
- A social environment consisting of an informal, vague group of people with a uniting interest; their sphere of activity; a subculture.