Possible Clues:

• Riddle: 'It's silver in the cinema'
• Bug blocker
• Movie theater feature
• Hide or show
• Show for all to see or hide from prying eyes
• Divider to select for suitability.
• Test for the presence of disease or infection, in the cinema?
• Examine carefully to select or eliminate
• Counsel never gets back for the cinema.
• Hide - show - partition