Possible Clues:

• Uncertainty of meaning
• Quality of oracular answers, often
• See ??-Across
• Equivocal expression
• Aspect of innuendo
• This does not make it clear how large I am to start with
• Equivocation sees a big turn in friendship
• Something open to differing interpretations
• I'm large enough to start to be twice as mean, perhaps
• Lack of a single meaning