Related Clues:

• Part of bridge - holding ace, take the lead
• Cask full of oxygen always needed for spacecraft
• Lead the way round one pillar
• Seaside feature includes one for the first time in the field
• In post, I break new ground
• Open up post containing a joke
• Mole interrupted by a certain person arriving early
• As a ground-breaker, I would need to be surrounded by support
• Launch - one ramming coastal feature
• First explorer
• Innovator; first settler
• One of Ballantyne's trail-blazers, or one of Cooper's?
• He's the first person admitted to landing-place
• Elementary particle always available for explorer
• Mole embraced single early settler