Possible Clues:

• Enormous gun keeping soldiers secure
• Aunt or uncle's leader?
• , 18 and 21: High water, and streak materialising ... that's very scary!
• Waterbird
• 'Just what I needed ...'
• With 66-Across, one of five found in this puzzle
• Word repeated before some relatives' names
• Word before "Scott" or "Caesar's ghost"
• Epithet for Gildersleeve
• Burns there, by the sound of it. Burns was