Possible Clues:

• Influential in future development
• Highly influential getting the lanes back around the road north from Dublin
• It is important to change lanes when encircling motorway
• Cooking meals in -- that's basic!
• Original artist in deal that falls short
• (Of a work) much influencing later developments
• Germinal
• Strongly influential
• Generating new developments for menials
• Influential males in management