Leading Cuban actors in parts (6)

I believe the answer is:

castro

I'm a little stuck... Click here to teach me more about this clue!

'parts' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'leading cuban actors' is the wordplay.
'actors' can be anagrammed to 'CASTRO'.
Though, I'm not sure how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for castro that I've seen before include "Cuban dictator" , "Old leader" , "Cuba's chief Fidel" , "Fidel . . . . . .,retired Cuban leader" , "Cuban co-star" .)

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.