Possible Clues:

• It shows distance travelled by river with nothing found in it
• That will show how far one tore around the dome
• Norman bishop met the Queen - it shows how far he went
• Oh, do start to tell me how far we've gone
• Distance-measuring instrument in vehicle
• Remote do (anag.)
• Cheat collected energy in alter­native measuring device
• It registers miles motored, possibly around the Orient
• Gauge on a car's dashboard
• Middle of a dash?