Possible Clues:

• Optical instrument with a powerful magnifying lens
• Astronomer's tool
• Optical instrument for viewing at a distance
• Can bits of steel manage to make one so long-sighted?
• A see-through for 15 down
• That helps one to be far-sighted
• Condense
• Shut up and manage after storm of sleet
• At last might Leslie manage to take the long view?
• Meteor shower