Possible Clues:

• Unpredictable criteria somehow putting one off
• Not fixed
• Unpredictable crater I observed erupting
• Irregular in movement or habit
• Volcanic crater one accepted as unpredictable
• Unpredictable - car tire (anag)
• Unpredictable rice dish to welcome sailor's return
• Fellow keeping animal of unpredictable character
• Not even this will do wrong with a twitch
• Deep affection