Parts of the theatre? (5)

I believe the answer is:

roles

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'parts' is the definition.
(parts in a play)

I don't understand how the rest of the clue works.

(Other definitions for roles that I've seen before include "Parts in a play" , "Parts in plays" , "Theatrical parts" , "Dramatic parts" , "Actors' parts" .)

I've seen this clue in The Mirror.

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