Possible Clues:

• Pronounce the letter H at the beginning of a word
• Speak with force like Hook, for example
• The sound of h from parasite
• Might make the snake cross with the sound of the H
• H may sound like a robber
• Like a criminal, see the sound of it
• What a Cockney may not do
• Pronounce with an h, like parasite
• Pronouncedly like a criminal
• Criminal-like to a pronounced extent