Possible Clues:

• Help up what may be read right across
• The Circle Line?
• Poet's line about a geometrician's one
• Red meat I moved a distance across plate?
• Girl climbing tree moving in straight line
• Line for the circle is put off around one in the morning
• Comes across a figure to aid breakdown on gas recorder
• Pipe measure
• Spoke twice to get measurement?
• Longest line in a circle