Possible Clues:

• Social misfit to appear or phone otherwise
• Loser in drama, musical one, meeting premature end
• Or phone (anag.)
• Person expected to fail
• Something even less use than Pandora's box?
• One not expected to succeed
• Failure of one dramatic work, then another shortly
• Useless racehorse - a refusal, lame, and starting early regularly
• One with little prospect of success
• Someone unable to comprehend an erroneous description of Pandora's box?