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Piece of writing found in small underground chapel, reportedly (6)

Ross

I believe the answer is:

script

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'piece of writing' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for script that I've seen before include "Orginal document" , "Person preparing text for film actors" , "Form of writing" , "Piece of handwriting" , "Written form (of play etc)" .)

I've seen this clue in The Telegraph.
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