Possible Clues:

• Bacterium, virus, etc
• Not unusual and not grand, either
• Standard Agatha Christie novel?
• As usual, no-one on the Bench
• George's role on ''Cheers''
• As usual it's absent mister back there
• The usual Tom Dick or Harry, he's not
• As usual, it's Mister upon the back
• Short man of acceptable standard
• 'Cheers' character