Possible Clues:

• Obscure relative seen by a river
• Obscure Sixties spy agency facing heartless state
• Vague, obscure
• Family member with cataract, essentially it's foggy
• Ambiguous rule can get broken
• Confusing relation by author losing heart
• Sam, for example, a Republican? That's iffy
• Dim kind of family initially delayed
• “Whereas an ambiguous statement may be vague by accident or intent, an equivocal one is calculatedly ____” (Bill Bryson, Troublesome Words)
• Hazy sort of explosion nitrogen's put down