Possible Clues:

• Introduction of hamadryad, perhaps a snake I have a high opinion of
• H sound — suck air in or out
• Snake enraged, it starts hissing
• Pronounce breathily
• Send something down the wrong pipe, as it were
• When to make an illegal copy of such a letter
• Say 'hey,' say
• A Parisian doesn't like to copy illegally?
• Wriggly thing, hopping mad, needing pee?
• How Hook appeared, having one to begin with