Possible Clues:

• Dirty dog, as it were
• Difficult person
• Don's a complicated and extremely unpleasant person
• No sodas for this unpleasant person
• What's-his-name's two short calls for help
• A mediocre build-up for what's-his-name
• Two notes from awkward customer
• SO2 for whatsisname
• Someone or other - unpleasant person!
• What tireless seamstresses do, reportedly, for a despicable type?