Related Clues:

• Submarine's viewing tube
• Range; opportunity
• Accessory for a marksman
• One's always up for a sea view
• Manage to follow shop's principal range
• Room that gives a better view?
• Means of looking above and beyond
• Snow now disappearing? Then manage field
• Carry on with second opportunity
• Sharpshooter's magnifier
• First of shooters to manage range
• Sharpshooter's aid
• View provider on a U-boat
• It sees over seas
• Optical instrument must be awfully precise when surgery's involved