Arabic, say, that actor has to learn (6)

I believe the answer is:

script

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'arabic say' is the definition.
(I know that Arabic is a type of script)

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

Can you help me to learn more?

(Other definitions for script that I've seen before include "Form of writing" , "Written copy of words to be spoken" , "Orginal document" , "Written version of a play" , "Calligraphy" .)

I've seen this clue in The Telegraph.

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