Possible Clues:

• Individual working in Lords breaks new ground
• Mr Morgan swallows one for the non-drinkers
• Trailblazers -- one found in jetties
• Ripe ones (anag.)
• Those breaking new ground outside the pub
• 3.14 + 1 + 2.72, right? Initially simple for leaders
• Groundbreaking ones
• Wagon train group
• First class?
• Leads the way