Related Clues:

• Single-mindedness that allows one to see the light, finally?
• and 4: Stunner seen on Eurostar maybe engenders unwavering concentration?
• Limited outlook shown by new king entering marriage after a little time
• Single-mindedness of worried vet on insulin
• Subway, basically
• Means of escaping prison, maybe
• Ant farm passageway
• Period before Easter revolves around a foreign means of escapism perhaps
• Really dig?
• A rather narrow view of what the mole is expected to look through
• Be boring, perhaps
• Way under a river
• Pole consumed by ditty initially lifted from The Great Escape perhaps
• Passage on apparition is far from the full view
• Underground thoroughfare