Possible Clues:

• Dominance
• Nancy cased building from influential position
• In part of church in French city daughters sway
• Can cyanide (not iodine) mixed with sulphur produce the dominating influence?
• Rise with African National Congress and you start to achieve dominance
• Condition of being dominant
• Influential position in unusual case detective's beginning in French city
• Candy canes (anag.)
• Candy canes crumbling in upper hand
• Take to the air with answer to corrupt New York City dominance