Possible Clues:

• Drama student's study
• It tells actors where to stand
• Fodder for a table read
• Improv show's lack
• Crisp packet's final design showing text
• Improv's lack
• Written text of a play, film etc.
• Writing 'share certificates' at end of document
• You'd expect to find this in 11 across for the players
• Ad-libber's discard