Possible Clues:

• Red hot tape turned out to be highly informative porn!
• Watergate figure
• 'All the President's Men' figure
• River grass encircling path, not a river grass
• Source for Woodward
• Informant might produce red-hot tape
• Source of secret information one used to swallow, to a great extent?
• Informer's secretive, who stitched soldiers up