Possible Clues:

• Norse god wielding a hammer
• Author Heyerdahl
• A god of little height in rock
• "The Avengers" character
• God — soften sound!
• Dweller in the hall Bilskirnir
• God almost a source of irritation?
• Germanic thunder god; early US IRBM
• God with Hugo is rigorous
• Old character not quite becoming a god