The most common and most likely answer to this crossword clue is the 5 letter word ROLES
I've seen this crossword clue in Financial Times
R
O
L
E
S
More clues leading to the result ROLES
Buddy explains!

The straight part
We know that "Parts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case parts = roles.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 ROLES mean?
ROLES noun- A character or part played by a performer or actor.
- The expected behaviour of an individual in a society.
- The function or position of something.
- Designation that denotes an associated set of responsibilities, knowledge, skills, and attitudes
- (grammar) The function of a word in a phrase.
- In the Raku programming language, a code element akin to an interface, used for composition of classes without adding to their inheritance chain.
- An ancient unit of quantity, 72 sheets of parchment.