Possible Clues:

• -- or ... .?
• Around the South there's some increase in code
• Dashes in Rome's code
• Less than a mouthful for a walrus
• Beginning to signal in additional code
• "Tru" star Robert
• Inspector glum, seeing Oriel's head disappear?
• In code the Walrus might have got fifty for a bit
• David of 'Hack'
• Around the South this in increasingly in code