Possible Clues:

• Going round
• It relates to an overview of The Sun and the path taken in a roundabout way
• Eye socket
• Test covers part of town bypass perhaps
• Test round part is going round
• Relating to a satellite's track
• The M25, for example — what may be said about small section?
• Revolutionary, in a way
• Sort of road test after component has been installed
• Round button originally secured by tailor that's loose